A beloved local teacher is brutally attacked in her Pennsylvania home; after 27 years, dedicated investigators trace her killer.

In 1979 two young boys find their mother's dead body in the living room; how the investigators track down the killer with no solid leads.

In 1976 a woman was left for dead in her home in southern California; despite a major manhunt, the violent killer avoided detection for over four decades.

In 1979 two young boys find their mother's dead body in the living room; how the investigators track down the killer with no solid leads.

In 1976 a woman was left for dead in her home in southern California; despite a major manhunt, the violent killer avoided detection for over four decades.

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A thump heard by the children in a Carlsbad, Calif., home is the first clue to a shocking mystery that involves some family secrets.

The drug-related death of a 17-year-old girl sheds light on a new class of synthetic drugs that has law enforcement agencies on alert.

The discovery of an Army captain's death in her El Paso, Texas, home shakes her tight-knit military community.

Murder Premonition; Lady and the Tramp; Getaway Photo; Coma Recovery; Newman's Lost Love; Update: Cop Assault.

Stamper's Rampage; Desperately Seeking Susan; Mucho Oro; Airline Employee Murder; Update: DJ Death; Hospital Hoax.

An in-depth look at unsolved mysteries including Rainboy, Louisiana Burning, Update: Car Crash Thank You, Donut Murder, and Social Security Murder.

Baron 52 Crew; Scared to Death; Update: Thumbs; Fertility Statues; Rest Stop Killer; Thank You Philip.

Casino Bandit; Update: Carolina Cop Killer; Cop Assault; Amelia Earhart (Parts 1 & 2); Down on the Farm.

When a young, handsome veterinarian is found dead in his home in Montana, the mystery remains unsolved for nearly two decades.

When a San Diego woman who is near death arrives at an emergency room, the FBI and local law enforcement are called in to try to solve a medical mystery and a horrific crime.

A young art student from Texas is found murdered in her bed with no sign of forced entry, indicating that she knew her killer.

A man who was recently acquitted of the murder of his ex-girlfriend's 12-year-old son tells his story; interview with the victim's mother and key players in the case.

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In 1979 two young boys find their mother's dead body in the living room; how the investigators track down the killer with no solid leads.

In 1976 a woman was left for dead in her home in southern California; despite a major manhunt, the violent killer avoided detection for over four decades.

A lorry driver is found dead behind the wheel in Camberley, England; police use a revolutionary technique of familial DNA analysis.

A young woman's body is discovered close to her home in Bath, England; police eventually track down the perpetrator of the heinous attack.

A lorry driver is found dead behind the wheel in Camberley, England; police use a revolutionary technique of familial DNA analysis.

A young woman's body is discovered close to her home in Bath, England; police eventually track down the perpetrator of the heinous attack.

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A successful businesswoman and mother of three is found shot in her office; the investigation into her death leaves a family divided.

Two decades after a Jacksonville, Fla., woman goes missing, her son solves the mystery that haunted his childhood.

After a sudden marriage creates tension between two families, a murder exposes secrets, lies and a long-buried mystery.

Don Kemp Story; Moss Beach Ghosts; Kerouac Fan; Update: Marsh, N.Y., State Serial Rapist; Baby's Breath.

Poison Pen; Champ; Li'l Miss + UD; Motorcyclist's Samaritan + UD; Update: Shroud of Turin.

Son of Sam; 48-Hour Fraud; Twisted Sisters; Update: Train Wreck Amnesia; Miracle Staircase.

Dreamy Disappearance; Mom & Pop Murders (Parts 1 & 2); Mystery Hum; Update: Missing Ex-Monk; Stalker Reward.

Marine Destroyed; Texas UFO; Lacrosse Star Murder; Larceny Lady; Update: Ladies Man; Phillip's Angel.

A community comes together to search for a young woman who goes missing from a Halloween party.

An investigation of a woman found murdered in Fort Worth, Texas.

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

A woman walks into her home to find her daughter covered in blood; a single drop of blood is the key to finding the attacker.

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A lorry driver is found dead behind the wheel in Camberley, England; police use a revolutionary technique of familial DNA analysis.

A young woman's body is discovered close to her home in Bath, England; police eventually track down the perpetrator of the heinous attack.

After being reported missing, a young couple's bodies are discovered more than sixty miles apart; how the dedicated investigators eventually find the killer.

The police investigation into the Washoe County murder.

After being reported missing, a young couple's bodies are discovered more than sixty miles apart; how the dedicated investigators eventually find the killer.

The police investigation into the Washoe County murder.

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Before time runs out, detectives race to find a Little Rock, Ark., realtor who went missing after showing a house.

A community is left in shock when a Cornell student and star athlete gets caught in the middle of a homicide investigation.

A hairdresser-turned-detective uncovers the truth behind the murder of a teenage girl at a scenic spot on a Utah river.

Sunnyvale Stalker; Missing in-Laws; Calling Dr. Fraud; Incredible Journeys; Update: Social Security Murder; Candy and Roxy.

Daughter Seeks Justice; Butch Cassidy; Pizza Man; Ghost Boy; Update: Amish Hostage Murder; Big Mac Shootout.

Dale Disappeared; Beauty Salon Killer; Death and Disappearance; Mom's Genetic Curse.

An in-depth look at a series of unsolved mysteries including Dying to Confess, Vince Foster, Walk-Ins, Missing Ex-Monk, Update: Thanks Big Brother, and Aphrodisiacs.

Desiree, an undesirable woman; the Bermuda Triangle; murder in Arlington; update on the hotel balcony death; a rainy day.

Murder Premonition; Lady and the Tramp; Getaway Photo; Coma Recovery; Newman's Lost Love; Update: Cop Assault.

Stamper's Rampage; Desperately Seeking Susan; Mucho Oro; Airline Employee Murder; Update: DJ Death; Hospital Hoax.

An in-depth look at unsolved mysteries including Rainboy, Louisiana Burning, Update: Car Crash Thank You, Donut Murder, and Social Security Murder.

Baron 52 Crew; Scared to Death; Update: Thumbs; Fertility Statues; Rest Stop Killer; Thank You Philip.

Casino Bandit; Update: Carolina Cop Killer; Cop Assault; Amelia Earhart (Parts 1 & 2); Down on the Farm.

Don Kemp Story; Moss Beach Ghosts; Kerouac Fan; Update: Marsh, N.Y., State Serial Rapist; Baby's Breath.

Poison Pen; Champ; Li'l Miss + UD; Motorcyclist's Samaritan + UD; Update: Shroud of Turin.

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After being reported missing, a young couple's bodies are discovered more than sixty miles apart; how the dedicated investigators eventually find the killer.

The police investigation into the Washoe County murder.

In 1994, 42-year-old Le Bich-Thuy is found dead next to her home; decades later, DNA and genealogy technology allow detectives to track down the killer.

A decades-long police investigation includes one of the worst miscarriages of justice in UK history.

In 1994, 42-year-old Le Bich-Thuy is found dead next to her home; decades later, DNA and genealogy technology allow detectives to track down the killer.

A decades-long police investigation includes one of the worst miscarriages of justice in UK history.

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The convicted murderer of a popular teacher is given a second chance at freedom when new evidence is revealed.

When a luxury car dealer is found dead, detectives suspect one of his lovers, but lack of evidence stalls the case for a year, until one clue breaks it wide open.

After a young father is found dead in his home in Jonesboro, Ark., the authorities search for the killer.

An in-depth look at a series of unsolved mysteries including Thomas Drake, Mad Maggio and Viet Pilot's daughter.

Twin Behind Bars, Unknown Arsonist, Fugitive Drug Dealer, Queen Mary Ghost Ship, Lucky Lost Love, and more mysteries.

What Happened to Natasha; Canadian UFO; Kiss of Death; Update: Drunk Driver; Ohio Video Robbery.

An exploration of the cases of Battling for Her Brother, Man Who Never Was, Robbinghood and Life After Life.

Model's Third Notebook; Port Chicago; Math Teacher Escape; Miracle Maker; Grandma's Grave.

When a dog trainer with celebrity clientele disappears, investigators track down a suspect with the help of two witnesses.

When the mysterious death of a 23-year-old mother in New Mexico goes unsolved, her family searches for answers.

The investigation into the death of a woman whose remains were found in her Frisco, Texas, garage leads detectives to a series of suspects with connections to the victim's complicated and secretive life.

The sister of a man who died after robbing a bank when a bomb that was placed around his neck detonated talks about the case.

Connie Craig-Carrol & Founder Ken Meares investigates Omega XL, the ultimate all-natural solution for joint pain from inflammation.

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In 1994, 42-year-old Le Bich-Thuy is found dead next to her home; decades later, DNA and genealogy technology allow detectives to track down the killer.

A decades-long police investigation includes one of the worst miscarriages of justice in UK history.

In 1973, two young girls are found murdered in the Welsh village of Llandarcy; the killer's identity remains a mystery until 2002.

With the help of familial DNA, detectives are able to track down and capture a serial rapist.

In 1973, two young girls are found murdered in the Welsh village of Llandarcy; the killer's identity remains a mystery until 2002.

With the help of familial DNA, detectives are able to track down and capture a serial rapist.

Connie Craig-Carrol & Founder Ken Meares investigates Omega XL, the ultimate all-natural solution for joint pain from inflammation.

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Save thousands on car repairs.

Randy Baker finds his calling as a counselor then winds up dead.

Authorities work to establish why a loving mother was brutally stabbed to death in her home.

Lurking in the woods and peeping through windows, a cold-blooded serial killer stalks his next victim.

Missing Teacher; Gander; Civil War Ghosts; Preppie Rape Trial; Update: Mom's Genetic Curse; Racial Rift.

Furniture Store Shoot Out; Comedy Store Ghosts; Gypsy Fraud; Shopping Mall Pen Pal; Update: Thank You Phillip.

Bentwaters UFO; Search for Kristi; Cult of Decloud; Update: Dates; Orthodox Jew.

Dead Man's Tale; Thanks Lieutenant Stephens; Telephone Call; Computer Con Killer; Ghost Writer.

Unsolved mysteries including the likes of Whistle Blown, Brenda's Fire, Southie, Electric Lady, and Marsh.

The investigation into the disappearance of a Marine's 19-year-old wife reveals a secret love triangle and multiple suspects.

A respected couple's murder leaves police puzzled and a blood-stained card at the scene is looked at again in the hopes it will yield new clues.

A woman sees a mysterious and deeply unsettling occurrence in her neighbor's yard; she wonders if it was an accident, but the truth will prove to be divisive.

An in-depth look at a series of unsolved mysteries including Thomas Drake, Mad Maggio and Viet Pilot's daughter.

Twin Behind Bars, Unknown Arsonist, Fugitive Drug Dealer, Queen Mary Ghost Ship, Lucky Lost Love, and more mysteries.

A couple's fortune in gold may be a motive for murder as business practices come under review and secrets are spilled.

Cardiologist Dr. Ernst von Schwarz, M.D. shows how to manage your blood pressure naturally and help protect your heart for life with My Best Heart.

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In 1973, two young girls are found murdered in the Welsh village of Llandarcy; the killer's identity remains a mystery until 2002.

With the help of familial DNA, detectives are able to track down and capture a serial rapist.

The exhaustive investigation into the murder of Tangie Sims; how genetic genealogy gave investigators the break they'd been waiting for.

A 69-year-old woman is found brutally murdered in 2011; after the case goes cold, new DNA technology eventually leads detectives to the truth.

The exhaustive investigation into the murder of Tangie Sims; how genetic genealogy gave investigators the break they'd been waiting for.

A 69-year-old woman is found brutally murdered in 2011; after the case goes cold, new DNA technology eventually leads detectives to the truth.

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When a young woman is found nearly murdered in her apartment, officials wonder if it is connected to the disappearance of a young woman in nearby Denver weeks earlier.

The murder of a California mother beloved by four men reopens a mystery surrounding another young woman's death that occurred decades earlier.

After finding his wife and two children dead, a former Indiana state trooper spends 13 years trying to clear his name.

Years after a woman is murdered in the back of her comic book store, new evidence is discovered that sends the investigation in a surprising direction.

A woman claims to have been abducted from her multi-million-dollar home, leaving more than 150 investigators to search for her.

A mother's death initially appears to be a suicide, but when investigators start to interview those closest to her, an evil plot emerges.

When a California housewife is murdered in broad daylight, the suspected killer claims it was a burglary gone awry.

What Happened to Natasha; Canadian UFO; Kiss of Death; Update: Drunk Driver; Ohio Video Robbery.

Two suspects are arrested for the murder of a millionaire 15 years after the crime was committed.

Family man Jack Jessee is murdered in his home, but the case goes cold until a dogged detective unravels a conspiracy and pins down the perpetrators.

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The exhaustive investigation into the murder of Tangie Sims; how genetic genealogy gave investigators the break they'd been waiting for.

A 69-year-old woman is found brutally murdered in 2011; after the case goes cold, new DNA technology eventually leads detectives to the truth.

Following the decadeslong investigation into the murder of Helene Pruszynski.

How an extensive investigation and revolutionary science of familial DNA revealed an attacker's identity.

Following the decadeslong investigation into the murder of Helene Pruszynski.

How an extensive investigation and revolutionary science of familial DNA revealed an attacker's identity.

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When a California housewife is murdered in broad daylight, the suspected killer claims it was a burglary gone awry.

During a weekend away, a longtime married couple go on an afternoon hike that ends in tragedy; a multitude of evidence makes the mystery hard to untangle.

When a mother of four dies unexpectedly on Valentine's Day, her death is attributed to natural causes, but a detective suspects that someone murdered the woman.

The unbelievable murder of Carol Kennedy, a popular college professor, artist and mother.

The disappearance of a 20-year-old honors student causes her family to fear the worst; decades later, the mystery is solved.

Missing Teacher; Gander; Civil War Ghosts; Preppie Rape Trial; Update: Mom's Genetic Curse; Racial Rift.

Furniture Store Shoot Out; Comedy Store Ghosts; Gypsy Fraud; Shopping Mall Pen Pal; Update: Thank You Phillip.

Bentwaters UFO; Search for Kristi; Cult of Decloud; Update: Dates; Orthodox Jew.

Dead Man's Tale; Thanks Lieutenant Stephens; Telephone Call; Computer Con Killer; Ghost Writer.

Unsolved mysteries including the likes of Whistle Blown, Brenda's Fire, Southie, Electric Lady, and Marsh.

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Following the decadeslong investigation into the murder of Helene Pruszynski.

How an extensive investigation and revolutionary science of familial DNA revealed an attacker's identity.

How the revolutionary new science of familial DNA helped catch a rapist.

The science of familial DNA is used to identify a rapist who eluded justice for years.

How the revolutionary new science of familial DNA helped catch a rapist.

The science of familial DNA is used to identify a rapist who eluded justice for years.

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When a young woman is found dead near a soccer field in Indiana, detectives try to piece together a puzzle that leads them to an unexpected suspect.

When detectives track down the killer of a Las Vegas cocktail waitress and mother, it becomes clear that the investigation has just begun.

A 29-year-old woman goes missing.

The Man Who Knew Too Much; Robinhood Rabbi; Totally Exhausted; Christmas Miracle Baby; update on Man Who Never Was; Med Scam.

DJ Death; Bonnie Craig; Lost Gause; Silicon Valley Hit; Fallon Illnesses.

Examining a series of unsolved mysteries, including Tami Lynn, Red Shoes, and Laura Outlaw, seeking to understand what they're about.

Ford's Fugue: Part 1 and 2; Edgar Cayce; Missing Theatre Student; Newsman's Lost Love.

Geri; Voice From the Grave; Phillip's Angel; Poverty Island Treasure; North Carolina Nightmare; Miracle Buffalo.

Susie Casey, an outgoing mother of four, is going through a divorce when she vanishes; police investigate three men.

A single dad and former firefighter is found dead in his garage; police use a neighbor's security footage to uncover a deadly secret.

A family visit over the holidays ends in tragedy when a man is found dead on the kitchen floor; authorities are faced with twists and turns in the case as new details emerge.

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

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How the revolutionary new science of familial DNA helped catch a rapist.

The science of familial DNA is used to identify a rapist who eluded justice for years.

In 1999, hospital worker Jennifer Watkins is sexually assaulted and murdered; 20 years later, revolutionary DNA testing helps to solve the cold case.

In Sacramento, Calif., three woman are brutally assaulted by the same man; investigators use genealogy to track down the suspect.

In 1999, hospital worker Jennifer Watkins is sexually assaulted and murdered; 20 years later, revolutionary DNA testing helps to solve the cold case.

In Sacramento, Calif., three woman are brutally assaulted by the same man; investigators use genealogy to track down the suspect.

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A 21-year-old college senior is shot and killed in a public park just months before her graduation.

Robert Davis, who was convicted of murdering a woman and her son, claims his confession was coerced and tries to prove he is innocent.

As detectives struggle to find leads in the murder of a college student, the perpetrator strikes again.

Shelly Loved Horses; Threats and Harassment; Strangulation Saga; Father/Son.

Murdered Heiress; UFO Odyssey: Part 1 and 2; England Heir; Looking for Christopher; Hospital Babynap.

Temple President's Murder; Ready Teller Robbery; Haunting on 37th Street; Where's Jim?; update on Cult of Decloud; Jane Doe's Ashes.

College Student Murders; Hemingway Curse; Friends to the End; Footlocker Bones; Update: Sweet Sue; School Bus Family.

Newlywed Escape; Iceman; Gang Mom; Experts Walker; Update: Motorcyclist's Samaritan; Little Miss Panasoffkee.

The remains of 11 female bodies are found in the desert outside of Albuquerque, N.M.

Campus cops make a terrible discovery in a dorm room after a boyfriend's weekend visit goes horribly wrong.

When a woman disappears after an encounter on a train, her family hires detectives to investigate.

A college student is found murdered in a residential neighborhood; as police search for the truth, they are stunned to learn that one of their own might be involved.

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In 1999, hospital worker Jennifer Watkins is sexually assaulted and murdered; 20 years later, revolutionary DNA testing helps to solve the cold case.

In Sacramento, Calif., three woman are brutally assaulted by the same man; investigators use genealogy to track down the suspect.

A young couple is murdered in Montana in 1956; in 2019, investigators use voluntary genealogical databases to catch the killer.

In 2018, a 79-year-old woman in Utah is sexually assaulted after a man breaks into her home; genetic genealogy immediately identifies the rapist.

A young couple is murdered in Montana in 1956; in 2019, investigators use voluntary genealogical databases to catch the killer.

In 2018, a 79-year-old woman in Utah is sexually assaulted after a man breaks into her home; genetic genealogy immediately identifies the rapist.

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When a Chicago woman from a big family goes missing, investigators begin to suspect a man in her life is full of secrets.

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

When a woman kills the man she suspects of being involved in an attack that left her husband dead and her young son wounded, she claims self-defense.

Balcony Death; Wickenburg Massacre; Dear Patricia; Prison Mom update; Cowboy Bandit; Life on Mars.

Huey Long: Part 1 and 2; Not Home for the Holidays; Broken Hearts; update on Thanks Lieutenant Stevens; Best Friend's Sister.

Folsom Escape; Georgetown Arson; Amnesia; State Department Murder; Update: Glendeen's Goal; Mona Lisa.

Death by Drowning; Thanks Captain Sharp; Pigtail Fugitive; Two Strikes; Direct Contact.

Gangbusters: Part 1 and 2; St. James' Ghost; Crystal; Cop Killer Escape.

The Man Who Knew Too Much; Robinhood Rabbi; Totally Exhausted; Christmas Miracle Baby; update on Man Who Never Was; Med Scam.

DJ Death; Bonnie Craig; Lost Gause; Silicon Valley Hit; Fallon Illnesses.