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Detectives and forensic experts recount cold cases solved using familial DNA testing.

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

The episode follows the 17-year police investigation and how detectives tracked down a serial rapist.

In Colorado in 1996 a young woman's body was found in an alley. After the case goes cold advancements in genetic technology lead police to the killer.

The episode follows the 17-year police investigation and how detectives tracked down a serial rapist.

In Colorado in 1996 a young woman's body was found in an alley. After the case goes cold advancements in genetic technology lead police to the killer.

Publicly they were a prominent family highly respected for their success. But privately a jury heard something else. It was case that pitted father against son, husband against wife and brother against brother.

Dateline NBC, or simply Dateline, is a weekly American television newsmagazine series. It was previously the network's flagship newsmagazine, but now focuses mainly on true crime stories with only occasional editions that focus on other topics.

It was a mystery from day one: a young father's life cut short. How Matt Podolak died was curious. The word poison kept coming up. Matt's brother would embark on a long quest for the truth.

Authorities are alerted after a pastor loses his second wife in a freak accident.

A look at the people who might have been responsible for the disappearance of a free-spirited woman.

A young model vanishes near Los Angeles; a woman probes her grandmother's disappearance. Also: claims concerning the role of a faith healer in a little girl's recovery.

Ghostly phenomena linked to a Civil War museum. Also: a rape suspect flees; a witness in a case against a car-theft ring vanishes before he can testify.

A purported haunting in a comedy club; claims of frauds perpetrated by a mother and daughter. Also: an attempted robbery at a furniture store is linked to the shootings of a man's wife and in-laws.

An alleged UFO sighting in the UK; claims of sexual and physical abuse by a cult leader; a religious student's murder. Also: a woman vanishes after arranging to meet with her ex-husband.

A man goes missing after getting drunk and taking a swim in a river; a missing daughter calls her mother seven years after disappearing; a love story unfolds.

The episode follows the 17-year police investigation and how detectives tracked down a serial rapist.

In Colorado in 1996 a young woman's body was found in an alley. After the case goes cold advancements in genetic technology lead police to the killer.

New DNA technology help uncover the truth behind a cold case of a 69-year-old woman who was killed in 2011.

Following the decadeslong investigation into the murder of Helene Pruszynski.

New DNA technology help uncover the truth behind a cold case of a 69-year-old woman who was killed in 2011.

Following the decadeslong investigation into the murder of Helene Pruszynski.

An in-depth look at the journalists who exposed the dangers of cult leader Reverend Jim Jones; interviews with witnesses to murders carried out by Jones' followers.

Profiling the case regarding a single dad and former firefighter who was found dead in his garage.

Investigators unlock a tool that may help unveil the identity of a schoolteacher's killer.

Ghostly phenomena at Moss Beach Distillery in California. Also: a university student vanishes after embarking on a cross-country trip; a newborn's miraculous recovery baffles doctors.

A baby's miraculous recovery; a liquor store owner's murder. Also: a man dies from carbon dioxide-poisoning in his garage; a bogus company is set up to bilk investors out of millions of dollars.

A con artist's scam; the death of a Los Angeles DJ. Also: children begin to contract leukemia in a small Nevada town.

A mysterious humming sound torments thousands across the globe; a husband and wife are wanted for the murders of the wife's aunt and uncle; a Phoenix man vanishes.

Psychic Edgar Cayce. Also: a woman goes missing after being seen at work; a man disappears after attending an off-campus party.

Newsmagazine that delivers viewers stories ranging from mysteries to documentaries.

When Michele is found dead, police officers uncover a fatal betrayal.

Police suspect natural causes as they investigate a man's death, until they they uncover a love triangle that turns the tragedy into a tangled mystery. Andrea Canning reports.

Police believed a pair of double homicides in Nebraska, five years apart, might be connected. Investigators working to solve the crimes feared the killer might strike again.

New DNA technology help uncover the truth behind a cold case of a 69-year-old woman who was killed in 2011.

Following the decadeslong investigation into the murder of Helene Pruszynski.

In 2001 a young couple were brutally assaulted in Salisbury Wiltshire. Over a decade later new DNA technology helped lead investigators to the attacker.

The case follows the investigation into the Halling Rapist and how familial DNA helped solve the crime.

In 2001 a young couple were brutally assaulted in Salisbury Wiltshire. Over a decade later new DNA technology helped lead investigators to the attacker.

The case follows the investigation into the Halling Rapist and how familial DNA helped solve the crime.

Investigation into the murder of a New York socialite.

A San Diego woman arrives at an emergency room, so the local law enforcement is called to solve a medical mystery.

College student Reagan Tokes worked a late shift at a local restaurant, then went missing. Police wondered if a break-up was to blame or if a string of alarming attacks were related. What happened to Reagan left her family and a city outraged.

Poverty Island's treasure; a rare calf is born; a woman claims that she's possessed by the spirit of a murdered co-worker; a Texas woman is shot dead.

Messages from beyond the grave bring comfort to families; an elementary-school student is kidnapped by a man claiming to be the boy's father; a woman searches for her birth mother.

UFO sightings in Virginia; the case of a missing heiress. Also: relatives of a New York corset maker are sought; a woman seeks her long lost brother; a newborn is kidnapped outside a Brooklyn hospital.

A purportedly haunted house; claims of physical and sexual abuse at the hands of a cult leader. Also: a wife is gunned down outside of her husband's office; a man leaves a family function and vanishes.

Two train fatalities are declared murder; human bones are found in a military footlocker; a woman seeks her half-sister; siblings look for each other.

A man finds his dead wife at the base of the stars.

An investigation into the murder of a father and his infant son, followed by his widow killing his business parter.

A mother of two disappears from her parents' home in Michigan without her phone and IDs. The police later declares her dead even without a body.

A single mother disappears after a night out. Her family searches for her. The police find suspects and clues, leading to a shocking signature from the killer.

In 2001 a young couple were brutally assaulted in Salisbury Wiltshire. Over a decade later new DNA technology helped lead investigators to the attacker.

The case follows the investigation into the Halling Rapist and how familial DNA helped solve the crime.

In 2001 a student is attacked in Williamsburg Virginia and months later the attacker strikes again. Finally new DNA technology reveals the perpetrator.

In 1999, hospital worker Jennifer Watkins was sexually assaulted and murdered. Two decades later, revolutionary DNA testing helps to solve this cold case.

In 2001 a student is attacked in Williamsburg Virginia and months later the attacker strikes again. Finally new DNA technology reveals the perpetrator.

In 1999, hospital worker Jennifer Watkins was sexually assaulted and murdered. Two decades later, revolutionary DNA testing helps to solve this cold case.

Investigation into the death of an extroverted salesman.

On a winter day, a wife and mother doesn't arrive at her son's birthday party. What happened to Darlene is investigated.

Denise Huskins surfaced two days after her boyfriend reported she was abducted and police accused the couple of a hoax. Then, another similar crime caused authorities to reexamine the case and led them to the unlikeliest of suspects.

An anti-gang crusader in New Jersey; a convicted murderer is profiled in California; simian creature sightings; a teacher helps her career-criminal husband escape from prison.

Microscopic evidence of life on Mars; the Wickenburg Massacre. Also: an aneurysm leaves a woman with memory loss and makes her prone to episodes of disappearing.

Fatal heart ailments plague a family; a man vanishes after being sued for the wrongful death of his wife; a woman seeks her sister and her biological parents.

The real-life Mona Lisa. Also: a sleeping woman is set on fire; a man who killed his father-in-law escapes from prison; two women are attacked in the basement of their apartment building.

A Texas man is strangled; a high-school student and her boyfriend go on the lam; claims concerning the afterlife are discussed; a family is skeptical of a coroner's findings.

Ghostly phenomena at Moss Beach Distillery in California. Also: a university student vanishes after embarking on a cross-country trip; a newborn's miraculous recovery baffles doctors.

A baby's miraculous recovery; a liquor store owner's murder. Also: a man dies from carbon dioxide-poisoning in his garage; a bogus company is set up to bilk investors out of millions of dollars.

A con artist's scam; the death of a Los Angeles DJ. Also: children begin to contract leukemia in a small Nevada town.

A mysterious humming sound torments thousands across the globe; a husband and wife are wanted for the murders of the wife's aunt and uncle; a Phoenix man vanishes.

Psychic Edgar Cayce. Also: a woman goes missing after being seen at work; a man disappears after attending an off-campus party.

Poverty Island's treasure; a rare calf is born; a woman claims that she's possessed by the spirit of a murdered co-worker; a Texas woman is shot dead.

Messages from beyond the grave bring comfort to families; an elementary-school student is kidnapped by a man claiming to be the boy's father; a woman searches for her birth mother.

In 2001 a student is attacked in Williamsburg Virginia and months later the attacker strikes again. Finally new DNA technology reveals the perpetrator.

In 1999, hospital worker Jennifer Watkins was sexually assaulted and murdered. Two decades later, revolutionary DNA testing helps to solve this cold case.

In 1992 a woman is sexually assaulted in Sacramento California by a man wearing a ski mask. This sexual predator continues to commit heinous crimes until new evidence exposes his identity.

When two teens are found dead in Montana, detectives suspect an infamous gangster might be responsible. But it will take 65 years to find the true culprit.

In 1992 a woman is sexually assaulted in Sacramento California by a man wearing a ski mask. This sexual predator continues to commit heinous crimes until new evidence exposes his identity.

When two teens are found dead in Montana, detectives suspect an infamous gangster might be responsible. But it will take 65 years to find the true culprit.

Ohio investigators search for answers in the decades-old murder of 10-year-old Amy Mihaljevic.

An advocate for missing and murdered Indigenous women searches for answers in the disappearance of her niece and exposes cracks in law enforcement.

When college student MacKenzie Lueck vanished from a park in Salt Lake City, her friends were dedicated to finding answers. The search made national headlines and the investigation revealed a secret that stunned even her closest friends.

A purportedly haunted hotel. Also: an exotic dancer is found dead in her home; the murder of a security guard in Chicago.

Ogopogo sightings in Canada; a teenage lifeguard's murder. Also: an unidentified skeleton raises questions in Kentucky; murders across three states are linked to the same gun.

A bank president's murder; a double agent's death. Also: an aspiring photographer goes missing; an escape artist is on the loose.

A boat vanishes off Miami; authorities seek a hitchhiker wanted for murder; a woman searches for her biological mother. Also: a mystery involving John Wilkes Booth.

The police seek a computer guru for fraud, embezzlement and theft of public property; a woman's boyfriend is kidnapped by her ex-husband; a couple seek the daughter they gave up for adoption.

Years after a Montana man is found dead, his son dreads what he'll find when he opens up the box of case files, giving him insight into what really happened. Keith Morrison reports.

A couple goes on a scuba-diving vacation in the British Virgin Islands. On the final dive of the trip, one of them surfaces but the other does not.

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.