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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.