Andrea Canning reflects on a story that reminded her how people can be vulernable and how quickly life can change; she speaks with Judge Esther Salas about the knock at her door that robbed her of the most important thing in her life.

He is the serial killer you've never heard of ... until now. In 1973, 22-year-old Doug Gretzler embarked on a cross-country road trip that spiraled into a brutal killing spree. In just three weeks, he and his accomplice, 28-year-old Willie Steelman, murdered 17 people. Their motive? A mystery that has left family members, law enforcement and experts baffled for decades. Drawing from first person interviews and over 500 hours of recorded conversations with Gretzler himself, hear his darkest confessions and the chilling psychology behind his crimes for the very first time.

When former Sen. Linda Collins of Arkansas is found fatally stabbed outside her home, detectives investigate if her murder is connected to her political career or her personal life; the victim's children speak out about the case.

When former Sen. Linda Collins of Arkansas is found fatally stabbed outside her home, detectives investigate if her murder is connected to her political career or her personal life; the victim's children speak out about the case.

A woman's death is initially ruled a suicide, but when a new investigation begins, police begin to suspect murder.

The body of insurance salesman Brian Davis is found alongside a bayou in Calcasieu Parish, La.; police discover that Davis had many secrets, and those closest to him may be involved in the death.

A Naval officer who rose through the ranks and once questioned terrorists at Guantanamo Bay is found by his wife, dead inside a Florida hotel room.

A wife claims she woke up to discover her husband had been shot to death as she slept next to him; police question if she is a shocked and grieving widow or if she's a cunning killer with a twisted master plan.

When a North Carolina preacher's wife is found murdered, police must determine not only who may have wanted her dead, but whether some members of the congregation are mourning -- or trying to cover up their part in the violent crime.

A family of rodeo queens is thrown into turmoil when their patriarch disappears from his Dalhart, Texas ranch; investigators search for the missing father, they expose family secrets that may lead to a murder plot.

The sister of a successful Hollywood producer is found dead in the garage of a home they share; with conflicting clues at the scene, authorities are left to determineif the cause of death is a tragic accident, suicide or a malicious plan.

After an avid outdoorsman dies from an apparent suicide, South Carolina investigators must unravel a murky story of mental health struggles and a complicated marriage that led to his death.

A grandmother is reported missing in Virginia weeks before her burned body is found in another state's woods; police navigate family tensions to uncover the truth behind her murder.

When a beloved grandfather is found shot dead in his Florida home, detectives fear his missing ex-wife is also in danger; as they uncover a tangled web of romance, infidelity and betrayal, new questions arise about her involvement in the murder.

A father of four vanishes days before Christmas; what authorities believe to be a bond violation, unfolds into something evil.

After a father is found dead in his family's Florida mansion, what at first appears to be suicide turns into a complex murder mystery where a mother's cryptic words and a son's suspicious behavior suggest either could be hiding a deadly grudge.

After a 911 hang-up, Pasco, Wash., police report to the caller's address and discover a beloved grandmother has been fatally shot; detectives will combat self-defense claims as evidence of a greedy scheme comes to light.

An aspiring young artist from Virginia is reported missing by his family. When his body is found weeks later, investigators must delve into his tumultuous family life and uncover an eyewitness who reveals the lies and deceit that led to his murder.

A son is reported missing after he fails to return home from a date; various Mississippi agencies unite to navigate his last moments and a false lead that will expose a cold-blooded scheme.

When a man is found dead at a secluded rest stop, Ohio police suspect foul play within his family; as evidence builds, tensions rise, and reveal the work of a criminal mastermind intent on manipulating everyone around them.

After the body of a small-town Mississippi woman is found in her garage and a mystery woman is caught red-handed on scene, police must work to identify a romantic rival obsessed with getting rid of the competition.

When a local musician is killed in a deliberate hit and run, rumors around his small South Carolina town suggest it's the result of an escalating family feud; the investigation reveals a killer hiding in plain sight and driven by revenge.

A Virginia father is reported missing two years after he was last seen; as the investigation ensues to track down his last location, a disturbing discovery will expose two mysterious deaths tied to a greedy scheme.

A woman's sudden death is initially ruled a suicide, but when new information comes to light, a shocking conspiracy is revealed; investigators unravel a tangled web of lies, betrayal and jealousy to uncover the truth behind her murder.

In an exclusive interview, Emma Coronel, wife of drug lord Joaquín "El Chapo" Guzmán, reveals the seduction and danger of life with a criminal mastermind, while confronting the ugliest truths of his actions and grappling with her own accountability.

After a plastic surgeon and local musician is murdered in his Asheville, N.C., home, investigators uncover a trail of clues pointing to an unlikely killer; new details emerge from exclusive TV interviews with insiders close to the case.

After a plastic surgeon and local musician is murdered in his Asheville, N.C., home, investigators uncover a trail of clues pointing to an unlikely killer; new details emerge from exclusive TV interviews with insiders close to the case.

A former marine who once was the hero for a woman in an abusive marriage may have let his desire to help go too far.

An Idaho woman's affair with her married boss leads to a lethal confrontation.

Deede Keller has a loving family, a tight circle of friends and a new man in her life; when she vanishes, disturbing clues point investigators to a suspect with a dark secret; the case provides a twist that leaves the courtroom astonished.

A popular therapist suffers a deadly attack in her Hollywood Hills home and police must trace a trail of deadly obsession and rage to find her killer.

The murder of a popular hairdresser in Cleveland leaves police stunned and desperate for answers; an unexpected break comes when a routine traffic stop in a neighboring county uncovers a vicious and deadly plot no one saw coming.

A well-respected firefighter and loving family man is found gunned down outside his Philadelphia home, sending police on a furious search for his killers; what they find stuns even the most hardened investigators among them.

The disappearance of a loving family in rural Arkansas leaves authorities searching for clues; a discovery puts them on the trail of ruthless killers driven by hate and revenge.

When a loving couple is discovered murdered execution-style in front of their Kansas home, police race to uncover the truth about who wanted them dead.

A shooting in the central Florida community of Deltona leaves a young man dead; while his fiancée mourns the death of her partner, police dig into their past to try and find out who would want to end their life together before it began.

A beloved Colorado postal worker and father is brutally gunned down on his daily route leaving authorities scrambling to piece together the evidence and find out who would want to execute this well-loved member of their community.

The apparent disappearance of a loving mother and wife seems to be an unsolvable puzzle, until a resolute Ohio detective teams up with an unlikely partner, the woman's heroic 11-year-old son.

When a businessman is gunned down in his home by a masked assailant, police scramble to figure out who could have wanted him dead; the case leads them on a bloody cross-country trek.

A father in Orange County, Calif. finds a young woman's slain body in his son's apartment and calls the police; he seeks his son and answers; the investigation uncovers an unexpected plot.

A late-night gaming party goes dangerously wrong when a young teenager disappears from the coastal town of Everett, WA.

Three years after a beloved member of a small town goes missing, a torrential storm lets loose a dark family secret.

When a rebellious teen disappears on her way to a concert, clues point detectives to dark rituals deep in the forest.

When Rob Limon is murdered at work, the investigation uncovers deep secrets about sex, friendship, religion, and family; it is a case featured in Dateline's chart-topping podcast Deadly Mirage.

When a rebellious teen disappears on her way to a concert, clues point detectives to dark rituals deep in the forest.

A popular therapist suffers a deadly attack in her Hollywood Hills home and police must trace a trail of deadly obsession and rage to find her killer.

The murder of a popular hairdresser in Cleveland leaves police stunned and desperate for answers; an unexpected break comes when a routine traffic stop in a neighboring county uncovers a vicious and deadly plot no one saw coming.

The investigation into a deadly home invasion involving a local business owner takes a turn when an unlikely witness comes forward; new details emerge from exclusive interviews and never-before-seen police interviews.

The investigation into a deadly home invasion involving a local business owner takes a turn when an unlikely witness comes forward; new details emerge from exclusive interviews and never-before-seen police interviews.

The double murder of Tammy Jo Parker and Bryan Capnerhurst appears to be a case of self-defense until it emerges that Parker's husband, Brett, is a bookie with a mounting gambling debt.

A quiet night is shattered when intruders terrorize a Florida couple and their young son, killing one of them; investigators question the initial story; a tip leads them to another family with dark secrets, and that's when bonds are tested.

In Mustang, Okla., firefighter Keith Bryan reconciles with his wife, then he is shot in his own home and dies a few hours later at a nearby hospital.

When a newlywed couple is shot in their North Carolina home, leaving the husband dead, investigators must determine if it's a robbery gone wrong or something more sinister; as the evidence piles up, it reveals a jealous lover hiding in plain sight.

When body parts start turning up across New York, panic sets in over the possible return of a known serial killer; as detectives connect the dots, they uncover a simmering dispute that exploded into a crime far more disturbing than anyone imagined.

An Iowa man is fatally shot, and his girlfriend claims self-defense; as their turbulent relationship is examined, her social media reveals a troubling pattern and sinister motive.

A respected soldier and beloved family man is found shot to death inside his home; investigators uncover a salacious love triangle and expose a murder-for-hire plot fueled by manipulation and greed.

A promising college student disappears after a Halloween party; as detectives hunt for any sign of the missing woman, they uncover a love triangle and a murder driven by manipulation and jealousy.

When a young father is murdered in his apartment, investigators learn the victim was involved in a bitter custody battle prior to his death. A series of abuse allegations complicate the investigation as detectives race to identify the killer.

The search for a missing elderly woman turns into a murder investigation after police discover a grisly crime scene. As authorities search for the last person to see her alive, they follow a digital trail that will expose a cold-hearted betrayal.

An apparent home invasion leaves a woman shot, her boyfriend dead, and police searching for two masked intruders; when inconsistencies in her story start piling up, police realize the woman at the center might not be the victim she claims to be.

20 years in the making, this special reexamines the Internet's first murder trial, revealing a twisted seductress with a skill for manipulation; after time in prison, she has a second chance at life and love with a stunning final update in her case.

A frantic 911 call captures a man's final moments after a brutal knife attack in his home. As their only eyewitness keeps changing her story, investigators dig deep to uncover a crumbling relationship and the sinister truth behind a vicious murder.

When police respond to a domestic disturbance in a Bay Area suburb, it's unclear who on scene was the intended victim; further investigation reveals a body, a carefully collected kill kit, and a slew of evidence of a lethal plan for revenge.

Robbery seems to be a plausible motive when a North Carolina man is found shot to death in a roadside ditch, but the case remains cold for years until a mysterious letter reveals a more sinister motive than anyone could have imagined.

A frantic 911 call captures a man's final moments after a brutal knife attack in his home. As their only eyewitness keeps changing her story, investigators dig deep to uncover a crumbling relationship and the sinister truth behind a vicious murder.

When police respond to a domestic disturbance in a Bay Area suburb, it's unclear who on scene was the intended victim; further investigation reveals a body, a carefully collected kill kit, and a slew of evidence of a lethal plan for revenge.

A well-respected firefighter and loving family man is found gunned down outside his Philadelphia home, sending police on a furious search for his killers; what they find stuns even the most hardened investigators among them.

When an Arkansas family man is shot to death in his home, his widow is quick to point the blame around town; detectives tail the suspects, a torrid affair and deadly secret come to light, revealing a manipulative wolf in sheep's clothing.

A frantic Ohio woman seeks refuge in a fast-food restaurant after escaping from a deadly assault; police sort through contradicting stories to expose a habitual criminal.

A former ballerina fatally shoots her estranged husband in what she claims to be an act of self-defense; the case receives major media coverage after a history of questionable allegations and conflicting narratives come to light.

The murders of two young women near a Phoenix canal remain unsolved for over 20 years until a team of cold case detectives take on the case and investigate a man known as the Zombie Hunter.

The murders of two young women near a Phoenix canal remain unsolved for over 20 years until a team of cold case detectives take on the case and investigate a man known as the Zombie Hunter.

Conflicting physical evidence confounds detectives after beauty queen Nona Dirksmeyer is found beaten to death in her Arkansas home.

When an athletic and popular college student is violently murdered in her apartment, police track down several surprising suspects, including one with a disturbing obsession, before crucial evidence unmasks a dangerous predator no one saw coming.

A fun-loving 59-year-old man is found shot to death in his home and his beloved jewelry collection has been stolen, leading detectives to a long list of suspects and a killer harboring a dark secret.

A 15-year-old missing persons case is reinstated when an anonymous tipster leads police to unearth a grisly murder; as witnesses come forward, North Carolina investigators must try to piece together the crime and bring the killer to justice.

After South Carolina authorities locate a burned and abandoned vehicle, they are led to a brutal crime scene at a local church leader's home. Their small community is divided when an unforeseen perpetrator is found responsible.

When the decomposed body of a woman is discovered inside a Las Vegas storage unit, investigators follow the clues to an unlikely culprit; a chilling tale of murder unravels, rooted in long-buried family secrets and eerie ties to the occult.

From 1993 to 2000, the quiet community of Fort Smith, Ark., is terrorized by a twisted serial killer, a deranged necrophiliac who targets elderly and vulnerable women; he becomes known as The River Valley Killer.

Nurse Charles Cullen is one of America's most prolific serial killers; police say he may have murdered up to 400 victims; Cullen claims he acted mercifully to end their pain; an in-depth look into the case reveals the truth behind his motives.

Police believe nurse Kristen Gilbert may have committed up to 60 murders at a hospital in Massachusetts; some say an affair drove Gilbert to murder while others think her narcissism caused the death of these innocent patients.

Self-named killer B.T.K. murders 10 people over 17 years, all while taunting Wichita, Kan., police and media before being exposed as family man and churchgoer Dennis Rader; in an exclusively acquired interview, he reveals what drove him to do it.

The man known as the Happy Face Killer viciously strangled eight women and dumped their bodies along the road.

A frantic 911 call captures a man's final moments after a brutal knife attack in his home. As their only eyewitness keeps changing her story, investigators dig deep to uncover a crumbling relationship and the sinister truth behind a vicious murder.

Colleen Stan relives what it was like to be kidnapped and imprisoned in a box, and how she escaped.

The stories of five women who suffered vile abuse while trapped inside the home of a prolific serial killer from which they eventually escaped.

When a rebellious teen disappears on her way to a concert, clues point detectives to dark rituals deep in the forest.

When police respond to a domestic disturbance in a Bay Area suburb, it's unclear who on scene was the intended victim; further investigation reveals a body, a carefully collected kill kit, and a slew of evidence of a lethal plan for revenge.

A veteran police officer gets attacked in the line of duty; detectives make it their mission to bring his killer to justice; as they investigate a troubled Philadelphia suburb, they soon uncover a crime of the ultimate betrayal.

Kay Mortensen took pride in preparing for every possible threat, so when he was found dead at home, those who knew him were stunned; the brutal killing put two of Kay's loved ones behind bars and in danger, but the truth may set them free.

Jodi Arias is convicted of murdering her ex-boyfriend, Travis Alexander.

In an effort to uncover the truth, a group of Detroiters band together to clear the names of Tommy and Ray Hughes who have spent 25 years in prison for a murder they say they did not commit.

Prosecutor Kelly Siegler and her co-counsel unravel the mysterious hit-style murder of young suburban mom Farah Fratta; to prove the suspect masterminded her murder, Kelly demonstrates how the killer used his church and children as an alibi.

When an elderly woman survives an attempted murder, investigators connect the dots on the deaths of other local senior citizens where families reported missing jewelry, leading to the hunt for a serial killer in Texas.

Driving home from a night out at a club, a nurse's aide strikes a homeless man on the freeway. The choices she makes after the crash, and her attempt to keep them a secret, are revealed when friends testify against her in a dramatic trial.

Two unlikely lovers form a secret bond held together by faith, but the polygamous marriage ends when a manipulative and deceitful charlatan kills the woman he once loved, the young mother of his two sons.

As a loving Oklahoma family embarks on a journey to understand the romantic relationship that led to a horrific murder, the relationship's secrets also reveal the killer responsible for two other murders from a years-old cold case.

A charismatic young woman meets a dynamic and handsome man at an Orlando nightclub, and it seems like a perfect match, but a secret marriage and a lover who just can't let go spells doom for two innocent victims.

A grad student is killed in her Rittenhouse Square apartment; detectives follow clues across the country, uncovering a hidden evil that changes how Philadelphia investigates sex crimes.

When a college student and exotic dancer is found dead after being thrown from a bridge, detectives investigate the controversial players in Rachel's double life and come up with a killer they never imagined.

NYPD detectives race to unravel the strange murder of one of their own before a devious killer slips out of the country.

An indie film star is found dead in Greenwich Village, the victim of an apparent suicide; as detectives discover one eerie clue after another, they realize things aren't what they seem.

Authorities are left stunned when stories of mysticism and conspiracy come to the front while they investigate the disturbing murders of an elderly Vietnamese couple in Texas.

Wilton Manors, Fla., investigators search for motives after a beloved father is found strangled and battered in his driveway, until an unsuspected confession reveals a complex web of deceit.

A bullet-riddled car, a missing driver, and no witnesses, an ambush or a random attack; the clue was something so tiny, it was measured in millionths of a meter.

Teenager is found half-naked with her throat slit; a single foreign hair found on her thumb may finger the killer.

Two women who lived in the same apartment complex were brutally murdered; the similarities of the crime scenes led police to believe they were dealing with a serial killer who hated women, and they had to find him before he struck again.

Weeks after a student vanishes, the body of an unknown female is found in the ashes of a fire 700 miles away; an alert policeman realizes the crimes could be connected.

Investigators face a growing list of suspects after a beautiful flight attendant is brutally murdered in her own home.

The assistant manager of the restaurant had been stabbed to death; police knew why he'd been killed: $8,000 was missing from the safe. As to who was responsible, his family and friends couldn't even imagine who'd want to hurt him.

Florida authorities rely on DNA evidence to try to nail the killer of a woman who was abducted from her late-night job at a convenience store, raped and strangled.

A wild fire in a secluded parking lot leads police to discover a dreadful homicide, with the suspect's image caught by security cameras.

After a prominent Arizona surgeon is found stabbed to death outside his office, investigators uncover an unlikely suspect with deep pockets and an even deeper hatred for the doctor.

Police don't have a basis for comparison to match shoe impressions, blood drops and DNA evidence from a murder scene.

A masked gunman kills two members of a family and wounds two others after they interrupt his burglary at their upscale suburban home.

A killer leaves equally incriminating evidence at the scene when he meticulously wipes away his fingerprint and shoe impressions.

After a woman is found dead at a yacht club in California in an apparent case of love gone wrong, investigators discover her home life was as dramatic as films made in nearby Hollywood.

The brutal murder of a state park employee over $2,000 rattles her co-workers and tourists while leaving police to sift through hundreds of leads.

Diving inside the mind of New York's most prolific serial killer, Joel Rifkin; through never-before-heard interviews from Attica Correctional Facility, Joel Rifkin reveals exclusive insights into the mind of a monster.

The missing-persons case of 12-year-old Jonelle Matthews in Colorado remains a mystery for more than three decades until detectives narrow in on a suspect whose bizarre behavior after her disappearance hints at something much more sinister.

The missing-persons case of 12-year-old Jonelle Matthews in Colorado remains a mystery for more than three decades until detectives narrow in on a suspect whose bizarre behavior after her disappearance hints at something much more sinister.

A woman is found murdered in the remains of a house that has burned to the ground, and it will take years to unravel the mystery of what happened to her.

Exploring the reign of the Southside Slayer and the truth; the Southside Slayer wasn't one man, but four separate serial killers operating at the same time in the same place.

Officers must determine if there is more than one killer at the same time when dozens of women are murdered around the city of Baton Rouge, La.

A killer is behind bars after DNA connects him to seven victims in Baton Rouge, La., but the murders don't stop after his arrest; new fear sweeps the city and law enforcement must act quickly to find a second, and maybe even a third, serial killer.

Retired Detective Ken Mains teams up with an inmate on death row to expose the secrets of unknown serial killer Joseph Naso: while bringing closure to a victim's family, Ken uncovers that Naso likely killed many more women than police ever thought.

Retired detective Ken Mains and inmate Bill Noguera uncover new details about serial killer Joseph Naso, who posed as a pro baseball team's photographer to hunt women and may have gone on a killing spree in Sin City.

Bill Noguera gets a written confession from serial killer Joseph Naso, cracking open another cold case from his list of 10; Detective Mains uncovers more potential victims from an infamous case in New York.

A young mother who is pregnant with her second child is gunned down on her way to work; her sisters become amateur detectives to help find her killer.

Pizza deliveryman Brian Wells robs a bank with a bomb strapped around his neck, launching one of the strangest cases ever investigated by the FBI.

A bank executive tries to rob his own bank; investigators think it's an inside job but eventually learn the crime is connected to a spree carried out by men who managed to keep their identities secret, preying on people who did the opposite.

Single mother Marie Singleton falls hard for Andre Jackson, a single dad raising his two kids; the couple marries and seems happy, then Marie vanishes and investigators discover secrets that may be related to her undercover job.

Raven Abaroa swoops into Vanessa Pond's life and steals her heart; then, Vanessa discovers her dream man has a tragic past: his first wife was killed; dark secrets are about to be spilled.

Wendy Trapaga is a beaming young bride, and just four days after saying "I do," she is found dead in a parking lot; investigators discover the newlyweds were keeping secrets, and there was also someone else involved with a secret.

In high school, Christian, Erika and Pedro formed a tight trio: best friends who excelled at academics and shared big dreams; when they went to college something changed; it started with a secret romance and ended in tragedy.

Nikki Whitehead was a single mom working toward a brighter future; she found love, moved into a nice neighborhood and enrolled in college, then tragedy struck; police searched for answers but one thing was certain: this crime was personal.

A cold-blooded serial killer lurks in the woods, stalking for his next victim; as Detective Bernie Nelson investigates, puzzling evidence leads him to more questions until one clue help crack the case wide open.

When Cara Ryan shoots her ex-husband and accuses him of threatening to kill her, police question her motive.

When Cara Ryan shoots her ex-husband and accuses him of threatening to kill her, police question her motive.

A trail of texts helps prosecutors build a case in the disappearance of Kevin Mengel, but a surprise awaits them.

A land developer disappears into the Arizona desert, and a brother sets out to uncover the truth; when hikers stumble onto a gruesome discovery, investigators quickly realize no one can be trusted when they find themselves in the line of fire.

A horrific discovery in a backyard cornfield is just the beginning of an unspeakable scene; as horrors unfold in this small Midwest town, someone is playing a deadly game of cat and mouse, and it will be years before a ghastly truth is revealed.

After the burned body of a local man is found in rural Missouri, the homicide goes unsolved for nearly two decades until a twisted murder plot is brought to light.

Investigators in Gresham, Ore., are left with a gruesome crime scene, an assailant on the loose and a missing child after the victim of a stabbing is able to call 911 in a last attempt to save her own life.

When a prominent Santa Rosa, Calif., couple is found gunned down at the offices of one of the world's most popular cartoons, detectives are left to untangle the inner workings of a decades-long marriage.

A frantic 911 call captures a man's final moments after a brutal knife attack in his home. As their only eyewitness keeps changing her story, investigators dig deep to uncover a crumbling relationship and the sinister truth behind a vicious murder.

The quintessential girl next door is discovered brutally killed on Thanksgiving weekend; it would take investigators over a year to uncover the dark obsession that led to her murder.

A foursome, a stripper, and a biker, is just the beginning for investigators of this massage table homicide; everyone is shocked as a secret fetish for murder is revealed.

A single mother is found shot and stabbed in her kitchen; multiple suspects emerge, but the true mastermind of this murder hits closer to home than anyone expected.

What started as a perfect marriage evolves into a threesome; after one of the participants winds up dead, the killer turns out to be someone the investigators never suspected.

Kelly and Abbey investigate the 1999 murder of a beloved churchgoing mother and grandmother, shot dead in her own home; with no known enemies, was she killed to send a cruel message to someone she loved?

Kelly and Tonya look into the murder of a hard-working mother who was stabbed and bludgeoned to death; the investigation uncovers a secret affair and a revelation as shocking as the murder itself.

Kelly and Steve join the Searcy Police Department to untangle the mystery of a popular hairstylist, murdered on the night of her thirtieth birthday; is it an old flame, a new boyfriend or someone else entirely?

Kelly and Steve investigate the mysterious murder of a devoted mother of four, found stabbed to death in her van with her wedding band on the floor; was an alleged secret affair behind the shocking crime?

A 49-year-old man was shot and killed while walking his dog in front of his Texas home. Josh Mankiewicz looks back at a case with an unusual motive.

A man with both power and prestige managed to fool everyone, right up until his arrest.

The case involved detective work so unique, it managed to stay with Dennis Murphy for years; days before Christmas, Michelle Martinko was visiting the mall when she was found stabbed to death; investigators found her killer almost 40 years later.

When Israel Keyes is caught for the murder of 18-year-old Samantha Koenig, police have no clue what they've stumbled upon; after intense games of cat and mouse, the FBI uncovers one of the most calculated serial killers it has ever encountered.

A mother of three married to a missionary is found dead on Valentine's Day; the investigation into the murder reveals answers close to home.

A mother of three married to a missionary is found dead on Valentine's Day; the investigation into the murder reveals answers close to home.

A young man is crushed by a truck in his father's driveway, leading police to first rule the death as an accident; the case is re-examined.

Family members desperately search for a missing Virginia teenager, not knowing police have a secret: they've discovered his body but refuse to release any info as they untangle an extraordinary motive.

Police search for an odd-looking gunman seen fleeing after shooting a young mom to death, and uncover a suspect who's not what they expect-with a motive that's impossible to comprehend.

After a young woman is found dead in a Texas lake, investigators hunt down a killer on the run.

A beloved chef and cooking instructor is found shot to death at work, and investigators are left baffled; but when a loved one's strange behavior draws their attention, detectives discover the killer has been right in front of their eyes.

An ailing man isn't seen for weeks, and his family and friends grow concerned; when his wife is confronted about her changing stories, her revelation shocks the community, and everyone who knows and loves her as a dedicated grandmother.

A Florida woman is shot in her vacation rental, and the hunt for her killer connects back to a murdered Minnesota farmer; clues point to a doting grandmother living a double life, who then leads authorities on a multi-state chase.

When an officer discovers a man dumping bags of more than 60 body parts into the Passaic River in East Rutherford, N.J., investigators work to identify the victim and corroborate the chilling story of a confessed killer.

A picture-perfect Navy family is shattered when the father is found shot to death after returning home from deployment; detectives are led to believe the crime is a tragic coincidence until a dark plan devised from lust and greed comes to light.

When a father in Spokane, Wash., is found shot to death in his vehicle, detectives work for years to unmask a vicious killer who isn't afraid to silence witnesses; they eventually uncover a long-kept family secret that breaks the case wide open.

After an Air Force recruiter is found dead in a ditch near his Ohio home, authorities chase down several leads until the case culminates with a sting operation worthy of an international spy drama.

After gunshots ring out in rural New Jersey, police discover a beloved father shot to death and a vehicle taken from the premises; investigators must determine if this is a random act of violence or a murder plot spun from an ongoing dispute.

After a local antique shop owner is murdered in a seemingly random home invasion, North Carolina police discover there is more to the story when a web of lies and infidelity are revealed.

A frantic 911 call captures a man's final moments after a brutal knife attack in his home. As their only eyewitness keeps changing her story, investigators dig deep to uncover a crumbling relationship and the sinister truth behind a vicious murder.

An entrepreneur forges an unlikely friendship with a ragtag group of skateboarders; but when he vanishes and signs point to foul play, police wonder whether he was really a friend or a target.

A cowboy more at ease with horses than people vanishes into the desert after running into a group of California ranchers who believe he's done them wrong.

When a rebellious teen disappears on her way to a concert, clues point detectives to dark rituals deep in the forest.

When a woman drowns in her tub, police think a recent purported suicide attempt holds the answer; but two years later when her husband confesses to the murder of his second wife, the cause of the first wife's death comes into question.

When an experienced outdoorsman is found stabbed to death on a hunting trip, investigators work tirelessly to eventually uncover the truth.

When a 71-year-old man is found shot dead in a field, investigators suspect his killing is the result of a robbery; as new evidence surfaces, detectives develop a theory to explain his death and only a voice from the grave can prove it.

A father in Orange County, Calif. finds a young woman's slain body in his son's apartment and calls the police; he seeks his son and answers; the investigation uncovers an unexpected plot.

When police respond to a domestic disturbance in a Bay Area suburb, it's unclear who on scene was the intended victim; further investigation reveals a body, a carefully collected kill kit, and a slew of evidence of a lethal plan for revenge.

Rachel Buffett, whose former fiance, Daniel Wozniak, was convicted of two grisly murders, talks about being at the center of the investigation.

Rachel Buffett, whose former fiance, Daniel Wozniak, was convicted of two grisly murders, talks about being at the center of the investigation.

A couple's romance on Nantucket Island turns tragic.

A husband gives a frantic call to 911 after finding his wife dead in a bathtub, but the couple's daughters lead police to investigate their father.

Karen Smith is murdered while her 5-year-old son is brutally stabbed and a neighbor says she knows who did it; she later recants her testimony and fights for the suspect's defense.

Decades after Susan Smith confessed to drowning her two small sons in South Carolina, she advocates for parole. Her ex-husband speaks out, arguing that Susan should remain behind bars for the notorious murder of their children.

When a missing young mother turns up murdered on the outskirts of New York City, it confirms a close-knit family's worst fears; the investigation is hindered by a series of lies, before a secret affair is uncovered, turning brothers into adversaries.

A woman is found stabbed to death in her own home; when police learn of her husband's brutal family history, a matriarch bludgeoned with an axe, an incestuous affair, and a vicious inheritance battle, they need to find out if there's a connection.

A retired police officer fears his missing daughter has been murdered, kickstarting an investigation where the killer appears to be one step ahead; a pair of twins hold a secret that threatens to tear apart their close bond.

An affluent family at war with each other for over a decade, find themselves at the center of a murder investigation when a beloved uncle is found dead. Police unravel a conspiracy involving a wayward son and a counterfeit secret agent.

A young mother's disappearance sparks a bitter division among those she leaves behind; as the infighting intensifies, detectives scramble to find out what happened to her, only to discover that a conspiracy to kill is fresh underway.

A gruesome Thanksgiving triple murder case lays bare a family's violent past, including a son and daughter each with a score to settle; as the years pass and the case goes unsolved, three families desperately fight for the truth and justice.

An unusual 911 call leaves investigators sorting fact from fiction in the search for a missing mother; while police begin to expect the worst, an illicit affair at the heart of the victim's family reveals a daughter with something to hide.

A California mom of three vanishes, and her car is found by the side of a desolate road with a suspicious flat tire; the case goes cold for years until a new detective takes on the case and is determined to get answers.

A night out on Hollywood's notorious Sunset Strip leads to a desperate search when a teenage girl doesn't make it home; the search for answers weaves though the strange side of Los Angeles before the tragic truth is uncovered in the Hollywood Hills.

When a rebellious teen disappears on her way to a concert, clues point detectives to dark rituals deep in the forest.

A gruesome discovery is made at a construction site when a man is found buried beneath a newly installed septic tank.

Kelly and Steve team up with the Anderson County Sheriff's Office to solve the horrific quadruple homicide of a family on Halloween; their investigation reveals a family feud, a trail of stolen cash, and a bloody shoe print left by the killer.

The "Cold Justice" team and the Anderson County Sheriff's Office continue their investigation into the quadruple homicide of a family of four in an attempt to finally give answers and justice to their grieving family and community.

A gruesome discovery is made at a construction site when a man is found buried beneath a newly installed septic tank.

When police respond to a domestic disturbance in a Bay Area suburb, it's unclear who on scene was the intended victim; further investigation reveals a body, a carefully collected kill kit, and a slew of evidence of a lethal plan for revenge.

When an Atlanta-area horse trainer abruptly vanishes from his ranch, police search for the missing father-to-be; discovering a salacious secret where untamed passions may have led to the victim's untimely demise.

An African immigrant is found tortured and murdered in his West End home; Atlanta detectives uncover a string of violent crimes tied to a terrifying criminal syndicate that the team must take down to restore peace to the Big Peach.

Mysterious deaths occur inside a traveling commune, starting an investigation that lasts more than a decade; two sisters -- former commune members -- reveal stories that involve lies, lust and greed.

Mysterious deaths occur inside a traveling commune, starting an investigation that lasts more than a decade; two sisters -- former commune members -- reveal stories that involve lies, lust and greed.

Hollywood actress Aasha Davis' sister, Lesley, goes missing after a fight with her husband never to be heard from again.

Out with his fiance on Halloween, a man leaves a bar with the rowdy crowd behind him and is never seen again.

Investigators look for answers when a popular school superintendent is found dead in his western New York home.

Sabrina Zunich tells the story behind her foster mother's murder, describes the secrets that led to it, details why she snapped, and discusses how she feels about it now.

Serving a life sentence for a murder she claims she didn't commit, Teresa Kotomski talks on camera for the first time, sharing the intimate secrets of her rocky marriage and detailing what she now alleges caused her husband's painful poisoning death.

A retired nuclear physicist is reported missing and investigators discover he lived a reclusive life fueled by paranoia, but as detectives race to find him, they begin to wonder whether his fears were unfounded or if his worst nightmare came true.

A general store owner in Rusk, Texas, calls 911 and makes a harrowing confession, but as detectives dig deeper, they discover a disturbing pattern making them rethink the motivation behind the crime.

An early morning apartment fire in Fort Worth, Texas, sparks a murder investigation when a young woman's body is found beaten and bound inside; detectives quickly work to solve the case and uncover an elaborate plot fueled by revenge and greed.

When a beloved mother goes missing on her birthday, detectives are faced with several possible suspects before focusing on a co-worker with a shocking past who will do anything to hide their true identity.

After a small-town man is found shot to death at a Missouri roadside park, the evidence trail leads detectives further into the man's complicated past where they uncover a wicked plot that no one saw coming.

Police follow a lead in a missing persons investigation to a 115-acre farm, unearthing the site of a gruesome crime and a seductive killer that will go down in New Hampshire history.

A loving father agrees to give his ex-wife a chance to reconcile; when his loved ones can't reach him, an unexpected tip is brought to Oklahoma police that uncovers a toxic love triangle and horrific crime scene.

A frantic 911 call captures a man's final moments after a brutal knife attack in his home. As their only eyewitness keeps changing her story, investigators dig deep to uncover a crumbling relationship and the sinister truth behind a vicious murder.

When a retired Dauphin County sheriff is found burned to death, investigators zero in on his wife's bizarre behavior. They must quickly determine whether the death was the result of a mental health crisis or a malicious plan to kill.

A San Diego teacher and coach is gunned down on the street, leaving his students and fiancée shattered; detectives swiftly retrace the suspect's steps to prevent future violence, while unveiling a sick, obsession-fueled murder plot.