A tech titan is stabbed to death in San Francisco, sparking headlines and rumors; speculators are quick to draw conclusions, but Josh Mankiewicz revisits how video evidence revealed a far more complicated truth.

Josh Mankiewicz returns to a case; a popular teacher was killed in her home; there was an arrest, a trial, and a verdict.

A tech titan is stabbed to death in San Francisco, sparking headlines and rumors; speculators are quick to draw conclusions, but Josh Mankiewicz revisits how video evidence revealed a far more complicated truth.

A wife and mother is taken into an unmarked car by a blond woman on a Monday morning, but police are unable to find any record of her arrest; for Josh Mankiewicz, this case reset the bar for brazen, and he revisits the reasons why.

Details expose how the Gucci family was undone by jealousy, backstabbing, and, ultimately, an act of murder; insiders close to the fashion empire speak out about the murder of a prominent family member.

Details expose how the Gucci family was undone by jealousy, backstabbing, and, ultimately, an act of murder; insiders close to the fashion empire speak out about the murder of a prominent family member.

A woman's story about an abduction and murder helps reopen a decades-old case that has weighed heavy on a New York town.

A man dies in a shooting incident after tempers flare in a confrontation in Montana's Glacier National Park.

A woman and her dogs disappear from their home.

When Karen Pannell is found stabbed to death, a message scrawled in blood seems like a beacon that could lead detectives to her killer; it takes a dogged forensic specialist with a keen eye to unravel the mystery.

It was a mystery that stumped investigators for years; a college student disappears after a night out clubbing; her mother thought she was at a sleepover with friends, and it takes an eagle-eyed detective to find the truth buried in a pile of lies.

When a fearless Las Vegas journalist is ambushed outside his home, the surveillance video shocks the city; the body tells a deeper story, one that may reveal what the camera missed.

A woman is found dead in an elevator, but her murder is just the beginning; as Barbara Butcher retraces the chain of evidence, she uncovers a domino effect of violence that leaves a trail of bodies across the Bronx.

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.

After a police chase ends in tragedy, Special Prosecutor Kelly Siegler returns to her rural roots to seek justice for a murdered game warden and his devastated family.

Post 9/11, terror strikes again when Queens and Brooklyn are rocked by the senseless killing of neighborhood shopkeepers; with no leads and a lack of motive, the NYPD must form a task force to catch the spree killer before he claims his next victims.

In the midst of a blizzard, the abduction of a Hasidic man from his Williamsburg office sparks a desperate NYPD search; as more dark details emerge, discoveries of debts, betrayal and ties to the Russian mob send police on a mission for the truth.

When a college student goes missing, a search of her Bronx apartment leads the NYPD to suspect foul play; the investigation stalls until a witness comes forward, prompting an undercover sting operation that blows the lid off a deadly conspiracy.

After a successful Korean-American business owner is killed during a home invasion, detectives believe his murder could be tied to a string of Philly crimes against businesses, until they uncover that the mastermind is someone much closer to home.

When a Philly radio personality is killed in her lavish Shore home, the years-long investigation reveals an undercover informant, an intricate murder-for-hire plot, and a vast trafficking conspiracy.

The stabbing murder of a 20-year-old woman in the suburbs of Philadelphia stymies detectives until a series of eerily similar murders six years later reveals a killer that has been hiding in plain sight all along.

After a young mother mysteriously disappears, all of Philadelphia unites in their efforts to find her. But as police begin peeling away the layers of her life, they discover the grisly truth behind what happened to her.

When deadly gunfire erupts in an Austin, Texas home in the middle of the night, detectives wonder if the homeowners' jewelry business is a possible motive; an investigation uncovers a suspect no one saw coming.

After a young mother mysteriously disappears, all of Philadelphia unites in their efforts to find her. But as police begin peeling away the layers of her life, they discover the grisly truth behind what happened to her.

A woman vanishes from small-town Oregon after heading to a Halloween party, leaving her family devastated and detectives hitting dead ends; years later, new evidence from a source reveals the plan to silence a victim.

When a mom is murdered in her suburban Connecticut basement, and her husband is found zip-tied to a chair, detectives pursue a camo-clad intruder and a twisted trail of digital evidence that uncovers a plan, months in the making.

When a successful Palm Springs art dealer goes missing, the search leads detectives through a complex web of charismatic conmen, luxury shopping sprees, and one small piece of evidence that uncovers an elaborate murder plot.

A similar abduction in New Mexico helps crack the case of a 19-year-old missing college student in Oregon.

A similar abduction in New Mexico helps crack the case of a 19-year-old missing college student in Oregon.

With no arrest having been made years after a real estate agent's murder, frustration continues to mount among her family and friends.

A man dies in a shooting incident after tempers flare in a confrontation in Montana's Glacier National Park.

A woman and her dogs disappear from their home.

Keith Morrison revisits a story that has haunted him for years; when detectives find a missing woman's car abandoned on a bridge, their investigation uncovers a tangled plot involving money, friendship and a deadly betrayal.

When Karen Pannell is found stabbed to death, a message scrawled in blood seems like a beacon that could lead detectives to her killer; it takes a dogged forensic specialist with a keen eye to unravel the mystery.

It was a mystery that stumped investigators for years; a college student disappears after a night out clubbing; her mother thought she was at a sleepover with friends, and it takes an eagle-eyed detective to find the truth buried in a pile of lies.

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.

When a fearless Las Vegas journalist is ambushed outside his home, the surveillance video shocks the city; the body tells a deeper story, one that may reveal what the camera missed.

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 woman is found dead in an elevator, but her murder is just the beginning; as Barbara Butcher retraces the chain of evidence, she uncovers a domino effect of violence that leaves a trail of bodies across the Bronx.

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.

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.

With just over one hundred residents, the farming village of Colon, Nebraska is built on trust; when county treasurer Sharron Erickson is found murdered in her town garage, Main Street becomes a crime scene where no one can trust their neighbor.

After a police chase ends in tragedy, Special Prosecutor Kelly Siegler returns to her rural roots to seek justice for a murdered game warden and his devastated family.

When 20-year-old Anna Cardwell is found shot to death in her rural Alabama home, her close circle of friends mourn in disbelief. But soon speculation begins to swirl that one of their own is not who they seem.

Post 9/11, terror strikes again when Queens and Brooklyn are rocked by the senseless killing of neighborhood shopkeepers; with no leads and a lack of motive, the NYPD must form a task force to catch the spree killer before he claims his next victims.

A university for the deaf serves as a haven for its students. But when a freshman is brutally murdered in his dorm, the student body is plunged into terror. When it happens again, investigators race to uncover a connection and stop a serial killer.

In the midst of a blizzard, the abduction of a Hasidic man from his Williamsburg office sparks a desperate NYPD search; as more dark details emerge, discoveries of debts, betrayal and ties to the Russian mob send police on a mission for the truth.

When a Sarasota, Florida gallery proprietor is found murdered and posed like a grisly sculpture, everyone in the renowned art community fears for their lives wondering if it could be one of their own artists putting evil on display.

When a college student goes missing, a search of her Bronx apartment leads the NYPD to suspect foul play; the investigation stalls until a witness comes forward, prompting an undercover sting operation that blows the lid off a deadly conspiracy.

After a successful Korean-American business owner is killed during a home invasion, detectives believe his murder could be tied to a string of Philly crimes against businesses, until they uncover that the mastermind is someone much closer to home.

After a woman's beaten body is found on the side of a road, a grisly scene is uncovered at a nearby motel; as police begin to put the pieces together, a man comes forward with details of the crime, leading to a toxic throuple that ended in bloodshed.

When a Philly radio personality is killed in her lavish Shore home, the years-long investigation reveals an undercover informant, an intricate murder-for-hire plot, and a vast trafficking conspiracy.

When a nurse's aide disappears without a trace, detectives learn she was entangled in a complex love triangle. After a tragic discovery in the woods, the investigation points to a sordid affair and a jealous lover looking for revenge.

The stabbing murder of a 20-year-old woman in the suburbs of Philadelphia stymies detectives until a series of eerily similar murders six years later reveals a killer that has been hiding in plain sight all along.

When sheriff-elect Derwin Brown is gunned down just days before taking office, investigators uncover a tangled web of secrets - forcing them to confront the chilling possibility that the killer may be hiding within law enforcement's own ranks.

After a young mother mysteriously disappears, all of Philadelphia unites in their efforts to find her. But as police begin peeling away the layers of her life, they discover the grisly truth behind what happened to her.

A young woman finds herself the target of a murder investigation after she befriends a mystery man who claims to be a secret agent with a license to kill.

When deadly gunfire erupts in an Austin, Texas home in the middle of the night, detectives wonder if the homeowners' jewelry business is a possible motive; an investigation uncovers a suspect no one saw coming.

When a nurse's aide disappears without a trace, detectives learn she was entangled in a complex love triangle. After a tragic discovery in the woods, the investigation points to a sordid affair and a jealous lover looking for revenge.

When sheriff-elect Derwin Brown is gunned down just days before taking office, investigators uncover a tangled web of secrets - forcing them to confront the chilling possibility that the killer may be hiding within law enforcement's own ranks.

After a young mother mysteriously disappears, all of Philadelphia unites in their efforts to find her. But as police begin peeling away the layers of her life, they discover the grisly truth behind what happened to her.

When a Sarasota, Florida gallery proprietor is found murdered and posed like a grisly sculpture, everyone in the renowned art community fears for their lives wondering if it could be one of their own artists putting evil on display.

A woman vanishes from small-town Oregon after heading to a Halloween party, leaving her family devastated and detectives hitting dead ends; years later, new evidence from a source reveals the plan to silence a victim.

Examining the story of Gypsy Rose Blanchard and Nicholas Godejohn and their joint decision to kill Dee Dee Blanchard; featuring an exclusive prison interview with Nicholas Godejohn.

When a mom is murdered in her suburban Connecticut basement, and her husband is found zip-tied to a chair, detectives pursue a camo-clad intruder and a twisted trail of digital evidence that uncovers a plan, months in the making.

When a successful Palm Springs art dealer goes missing, the search leads detectives through a complex web of charismatic conmen, luxury shopping sprees, and one small piece of evidence that uncovers an elaborate murder plot.

A pregnant woman's unexplained disappearance casts suspicion on a mysterious couple who recently entered her life.

A similar abduction in New Mexico helps crack the case of a 19-year-old missing college student in Oregon.

A similar abduction in New Mexico helps crack the case of a 19-year-old missing college student in Oregon.

With no arrest having been made years after a real estate agent's murder, frustration continues to mount among her family and friends.

Nathan and Denise Leuthold build their family on faith, but suddenly one of them dies, and the other is under suspicion; it's a story that stays with Andrea Canning, both because of what happened and when it happened: Valentine's Day.

A couple seems made for each other, but a secret is uncovered, and their passion turns into violence, then an elaborate plot is hatched to get revenge.

A high-society hustler spins lies and practices deceit for decades, leading to an investigation during which cold case detectives retrace the steps of this charming con man to see if he was guilty of murder.

Keith Morrison revisits a story that has haunted him for years; when detectives find a missing woman's car abandoned on a bridge, their investigation uncovers a tangled plot involving money, friendship and a deadly betrayal.

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 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.

After a former fire department volunteer dies in a house fire, inexplicable findings on scene, prison informants, and forged documents expose a duplicitous scheme, driven by insatiable greed, that began more than two years prior.

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.

When a Brooklyn native is found shot to death in the backseat of his car in a rough Atlanta neighborhood, police have to figure out if trouble followed him south or if the killer is in his inner circle.

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.

A mysterious shooting of a religious family man leaves a community questioning if it was a drug-related slaying or a bloody family affair.

With just over one hundred residents, the farming village of Colon, Nebraska is built on trust; when county treasurer Sharron Erickson is found murdered in her town garage, Main Street becomes a crime scene where no one can trust their neighbor.

A quiet Wisconsin town is rocked by its first homicide in six years when an eccentric father of four is found dead in his basement.

When 20-year-old Anna Cardwell is found shot to death in her rural Alabama home, her close circle of friends mourn in disbelief. But soon speculation begins to swirl that one of their own is not who they seem.

An Army vet survives two tours in Iraq, only to be gunned down in his own home.

A university for the deaf serves as a haven for its students. But when a freshman is brutally murdered in his dorm, the student body is plunged into terror. When it happens again, investigators race to uncover a connection and stop a serial killer.

A parking lot shooting in the dead of night leaves detectives with a long list of suspects, but the killer hides in plain sight.

When a Sarasota, Florida gallery proprietor is found murdered and posed like a grisly sculpture, everyone in the renowned art community fears for their lives wondering if it could be one of their own artists putting evil on display.

A troubled woman turns her life around when she moves back home to the family farm; when her elderly mother disappears, police uncover a twisted web of deceit, betrayal and forbidden romance.

After a woman's beaten body is found on the side of a road, a grisly scene is uncovered at a nearby motel; as police begin to put the pieces together, a man comes forward with details of the crime, leading to a toxic throuple that ended in bloodshed.

When a charismatic father and adored member of the local youth sports community is bludgeoned to death, police must discern fact from fiction to pinpoint his murderer.

When a nurse's aide disappears without a trace, detectives learn she was entangled in a complex love triangle. After a tragic discovery in the woods, the investigation points to a sordid affair and a jealous lover looking for revenge.

After a young mother is murdered in broad daylight, Texas authorities are on a hunt for a masked gunman; the ensuing investigation uncovers a bitter custody battle and a vicious plot born of obsession.

When sheriff-elect Derwin Brown is gunned down just days before taking office, investigators uncover a tangled web of secrets - forcing them to confront the chilling possibility that the killer may be hiding within law enforcement's own ranks.

A young woman finds herself the target of a murder investigation after she befriends a mystery man who claims to be a secret agent with a license to kill.

When a nurse's aide disappears without a trace, detectives learn she was entangled in a complex love triangle. After a tragic discovery in the woods, the investigation points to a sordid affair and a jealous lover looking for revenge.

When a nurse's aide disappears without a trace, detectives learn she was entangled in a complex love triangle. After a tragic discovery in the woods, the investigation points to a sordid affair and a jealous lover looking for revenge.

When a beloved woman in North Carolina is found stabbed to death in her own home, investigators uncover an unnerving history of harassment carried out by a killer blinded by jealousy.

When sheriff-elect Derwin Brown is gunned down just days before taking office, investigators uncover a tangled web of secrets - forcing them to confront the chilling possibility that the killer may be hiding within law enforcement's own ranks.

The body of a teen is found at a local party spot and theories surrounding her death spread, but the case goes cold for 30 years, until the investigation heats back up.

When a Sarasota, Florida gallery proprietor is found murdered and posed like a grisly sculpture, everyone in the renowned art community fears for their lives wondering if it could be one of their own artists putting evil on display.

Authorities are puzzled when a beloved Georgia grandmother is shot execution style, but as the investigation unfolds, a once close-knit family turns against itself.

Examining the story of Gypsy Rose Blanchard and Nicholas Godejohn and their joint decision to kill Dee Dee Blanchard; featuring an exclusive prison interview with Nicholas Godejohn.

After leads dry up in a missing person case, detectives in Ennis, Texas, discover a severed body part at a nearby lake; after confirming the DNA match, they begin to uncover the rippling relationship that led to the death of a beloved father.

The stabbing murder of a 20-year-old woman in the suburbs of Philadelphia stymies detectives until a series of eerily similar murders six years later reveals a killer that has been hiding in plain sight all along.

A pregnant woman's unexplained disappearance casts suspicion on a mysterious couple who recently entered her life.

After a young mother mysteriously disappears, all of Philadelphia unites in their efforts to find her. But as police begin peeling away the layers of her life, they discover the grisly truth behind what happened to her.

When Tina Sandoval disappears, her parents and loved ones spend years searching for her; a secret she was keeping may lead to clues about what happened to her.

When Tina Sandoval disappears, her parents and loved ones spend years searching for her; a secret she was keeping may lead to clues about what happened to her.

An aspiring Playboy model is brutally murdered in Miami after visiting a nightclub with her boyfriend.

Nathan and Denise Leuthold build their family on faith, but suddenly one of them dies, and the other is under suspicion; it's a story that stays with Andrea Canning, both because of what happened and when it happened: Valentine's Day.

When an unknown body surfaces in the icy East River, Barbara Butcher joins detectives in a race to reconstruct the victim's identity using the few fragile clues left behind; pressure mounts when a report comes in that there may be more victims.

When a garbage bag containing a young woman's body is dumped in a NYC tunnel, Barbara Butcher and a rookie homicide detective unravel how a seemingly straightforward crime conceals a chain of forensic contradictions, and a killer no one saw coming.

When a novelist's wife is found dead at the bottom of the stairs, investigators wonder if it is an accident or murder; Dennis Murphy interviews main suspect Michael Peterson and returns to the case with insight only he can share.

Kelly and her team investigate a murder that shocked the small Louisiana community of Morehouse Parish; the brutal stabbing and bludgeoning of beloved mother and church member Mattie Williams; enhanced episode.

Siegler and McClary travel to Dickson County, Tenn. to search for clues that may help solve the 1998 murder of a grocery store owner.

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.

Kelly and Steve investigate the murder of a 17-year-old girl found strangled to death by the railroad tracks.

After a former fire department volunteer dies in a house fire, inexplicable findings on scene, prison informants, and forged documents expose a duplicitous scheme, driven by insatiable greed, that began more than two years prior.

When a Holocaust survivor and the king of the disco scene is found bound and murdered on the Upper East Side, detectives embark on a multi-borough investigation, uncovering a salacious private life with a woman who may hold clues to his demise.

When a Brooklyn native is found shot to death in the backseat of his car in a rough Atlanta neighborhood, police have to figure out if trouble followed him south or if the killer is in his inner circle.

When a killer tries to use the chaos of one of New York's worst weather catastrophes to get away with murder, detectives in Far Rockaway, Queens fight through Mother Nature's wrath, uncovering a plot of lust, jealousy and, ultimately, betrayal.

A mysterious shooting of a religious family man leaves a community questioning if it was a drug-related slaying or a bloody family affair.

When a Bronx businessman is gunned down at a drive-through, detectives look back into the series of vicious attacks on the family that led up to the murder. A trail of text messages leads to a shocking perpetrator nobody ever could have imagined.

A quiet Wisconsin town is rocked by its first homicide in six years when an eccentric father of four is found dead in his basement.

When a Costa Rican computer programmer in search of the American Dream appears dead in his bathtub; detectives dive into a complex web of love, betrayal and organized crime, uncovering an unimaginable motive behind his brutal murder.

An Army vet survives two tours in Iraq, only to be gunned down in his own home.

When a beloved North Philadelphia school teacher is ambushed in a Dunkin' Donuts drive-thru, detectives uncover a deadly plot involving jealousy, deceit, and revenge.

A parking lot shooting in the dead of night leaves detectives with a long list of suspects, but the killer hides in plain sight.

The investigation of a bridal shop supervisor's violent murder leads detectives to Philly's music scene to reveal a hit list, an ultimatum, and an abusive musical mastermind.

A troubled woman turns her life around when she moves back home to the family farm; when her elderly mother disappears, police uncover a twisted web of deceit, betrayal and forbidden romance.

A beloved couple is found murdered among a lifetime of valuable collectibles in their home; investigators want to know if there is a connection between the memorabilia and the murders.

When a charismatic father and adored member of the local youth sports community is bludgeoned to death, police must discern fact from fiction to pinpoint his murderer.

International fugitive Nicholas Rossi faked his death as investigators closed in on him after rape and fraud allegations; Andrea Canning tracks down the man of many identities and looks back on one of the wildest interviews of her career.

After a young mother is murdered in broad daylight, Texas authorities are on a hunt for a masked gunman; the ensuing investigation uncovers a bitter custody battle and a vicious plot born of obsession.

When a nurse's aide disappears without a trace, detectives learn she was entangled in a complex love triangle. After a tragic discovery in the woods, the investigation points to a sordid affair and a jealous lover looking for revenge.

A man is found stabbed to death after a night in a strip club; a drop of blood on a bedspread becomes critical evidence five years later.

After police identify a murder victim thanks to her butterfly necklace, they discover several co-workers had vendettas against the victim.

When a beloved woman in North Carolina is found stabbed to death in her own home, investigators uncover an unnerving history of harassment carried out by a killer blinded by jealousy.

The brutal murder of a construction site foreman looks like the work of a disgruntled employee, but forensic science points to an unlikely suspect.

A shooting victim mutters the name of her apparent assailant before dying, but fingerprint comparisons, handwriting analysis, ballistics and DNA testing show someone else close to home is the true killer.

The body of a teen is found at a local party spot and theories surrounding her death spread, but the case goes cold for 30 years, until the investigation heats back up.

A woman's story seemed far-fetched; she tells investigators that a man broke into her home wearing only underwear and gloves, killed her boyfriend and raped and terrorized her.

After a Delaware man's mother is found dead, he tells a story that's so improbable police think it can't possibly be true.

Authorities are puzzled when a beloved Georgia grandmother is shot execution style, but as the investigation unfolds, a once close-knit family turns against itself.

A family vacation turns into a terrifying search for a missing wife and baby, then becomes a manhunt for a killer who committed a horrific crime.

A DNA dragnet catches a killer eight years after the kidnapping, rape and murder of a college coed in Oklahoma.

A nosy neighbor with a disturbing obsession becomes a suspect in a woman's murder at an upscale apartment complex; police discover an incredible link to an unrelated murder thousands of miles away.

After leads dry up in a missing person case, detectives in Ennis, Texas, discover a severed body part at a nearby lake; after confirming the DNA match, they begin to uncover the rippling relationship that led to the death of a beloved father.

A college student turns up dead, and her boyfriend becomes a prime suspect when blood splatters are discovered on his wall.

When sheriff-elect Derwin Brown is gunned down just days before taking office, investigators uncover a tangled web of secrets - forcing them to confront the chilling possibility that the killer may be hiding within law enforcement's own ranks.

The stabbing murder of a 20-year-old woman in the suburbs of Philadelphia stymies detectives until a series of eerily similar murders six years later reveals a killer that has been hiding in plain sight all along.

A manipulative woman enlists her father to carry out her devious plan to kill her ex-husband.

After a young mother mysteriously disappears, all of Philadelphia unites in their efforts to find her. But as police begin peeling away the layers of her life, they discover the grisly truth behind what happened to her.

After a woman disappears on a bone-chilling night, her husband provides a strange alibi, claiming he was camping at the time with their two young sons.

A Chicago Bears football player's relationship with a woman who is expecting their first child ends in tragedy.

Abducted in Ecuador, a young woman hatches a plan to escape using something hidden at the bottom of her bag.

When an unknown body surfaces in the icy East River, Barbara Butcher joins detectives in a race to reconstruct the victim's identity using the few fragile clues left behind; pressure mounts when a report comes in that there may be more victims.

When a garbage bag containing a young woman's body is dumped in a NYC tunnel, Barbara Butcher and a rookie homicide detective unravel how a seemingly straightforward crime conceals a chain of forensic contradictions, and a killer no one saw coming.

Kelly and her team investigate a murder that shocked the small Louisiana community of Morehouse Parish; the brutal stabbing and bludgeoning of beloved mother and church member Mattie Williams; enhanced episode.

Siegler and McClary travel to Dickson County, Tenn. to search for clues that may help solve the 1998 murder of a grocery store owner.

Kelly and Steve investigate the murder of a 17-year-old girl found strangled to death by the railroad tracks.

When a Holocaust survivor and the king of the disco scene is found bound and murdered on the Upper East Side, detectives embark on a multi-borough investigation, uncovering a salacious private life with a woman who may hold clues to his demise.

When a killer tries to use the chaos of one of New York's worst weather catastrophes to get away with murder, detectives in Far Rockaway, Queens fight through Mother Nature's wrath, uncovering a plot of lust, jealousy and, ultimately, betrayal.

When a Bronx businessman is gunned down at a drive-through, detectives look back into the series of vicious attacks on the family that led up to the murder. A trail of text messages leads to a shocking perpetrator nobody ever could have imagined.

When a Costa Rican computer programmer in search of the American Dream appears dead in his bathtub; detectives dive into a complex web of love, betrayal and organized crime, uncovering an unimaginable motive behind his brutal murder.

When a beloved North Philadelphia school teacher is ambushed in a Dunkin' Donuts drive-thru, detectives uncover a deadly plot involving jealousy, deceit, and revenge.

The investigation of a bridal shop supervisor's violent murder leads detectives to Philly's music scene to reveal a hit list, an ultimatum, and an abusive musical mastermind.

A beloved couple is found murdered among a lifetime of valuable collectibles in their home; investigators want to know if there is a connection between the memorabilia and the murders.

International fugitive Nicholas Rossi faked his death as investigators closed in on him after rape and fraud allegations; Andrea Canning tracks down the man of many identities and looks back on one of the wildest interviews of her career.

A man is found stabbed to death after a night in a strip club; a drop of blood on a bedspread becomes critical evidence five years later.

After police identify a murder victim thanks to her butterfly necklace, they discover several co-workers had vendettas against the victim.

The brutal murder of a construction site foreman looks like the work of a disgruntled employee, but forensic science points to an unlikely suspect.

A shooting victim mutters the name of her apparent assailant before dying, but fingerprint comparisons, handwriting analysis, ballistics and DNA testing show someone else close to home is the true killer.

A woman's story seemed far-fetched; she tells investigators that a man broke into her home wearing only underwear and gloves, killed her boyfriend and raped and terrorized her.

After a Delaware man's mother is found dead, he tells a story that's so improbable police think it can't possibly be true.

A family vacation turns into a terrifying search for a missing wife and baby, then becomes a manhunt for a killer who committed a horrific crime.

A DNA dragnet catches a killer eight years after the kidnapping, rape and murder of a college coed in Oklahoma.

A nosy neighbor with a disturbing obsession becomes a suspect in a woman's murder at an upscale apartment complex; police discover an incredible link to an unrelated murder thousands of miles away.

A college student turns up dead, and her boyfriend becomes a prime suspect when blood splatters are discovered on his wall.

When sheriff-elect Derwin Brown is gunned down just days before taking office, investigators uncover a tangled web of secrets - forcing them to confront the chilling possibility that the killer may be hiding within law enforcement's own ranks.

A manipulative woman enlists her father to carry out her devious plan to kill her ex-husband.

When a woman is abducted during her evening shift at a gift shop, her family keeps the case in the public eye for decades, until investigators finally solve the mystery.

When a woman is abducted during her evening shift at a gift shop, her family keeps the case in the public eye for decades, until investigators finally solve the mystery.

A mystery in paradise unfolds when Sarm Heslop vanishes from her boyfriend's luxury yacht in the U.S. Virgin Islands; chilling details emerge on the case that made international headlines and left investigators with more questions than answers.