The investigation into a newlywed's disappearance focuses on her job as a CIA employee as a possible clue.

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

A microscopic clue and a stroke of luck help authorities solve the murder of a young woman.

Four years after a 28-year-year old's death, a jury must decide if it was suicide or murder.

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

The security cameras at a woman's home may hold the key to solving the mystery of her disappearance.

A hairdresser-turned-detective uncovers the truth behind the murder of a teenage girl in Utah.

A Cornell student and star athlete gets caught in the middle of a homicide investigation.

Detectives race to find a Little Rock, Ark., realtor who went missing after showing a house.

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

When remains are found amid the rubble after a house fire, authorities soon discover the incident was no accident.

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

After a woman reports a prowler, police find her Olympic bronze medalist husband dead in their backyard.

When a Chicago woman goes missing, investigators begin to suspect a man in her life.

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

Investigation into the murder of a couple in South Carolina reveals a feud and divides a family.

Park rangers question whether a fatal fall was an accident or the result of an act of violence.

Detectives suspect an inside job when a coin collector and his wife are found dead in their home.

The drug-related death of a 17-year-old girl sheds light on a new class of synthetic drugs.

The mystery of a Florida hotel owner's disappearance confounds family, friends and detectives.

Robert Davis, who was convicted of murdering a woman and her son, claims his confession was coerced.

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

A businessman tries to prove that a confession was coerced and a teen was wrongfully convicted.

The investigation into the death of a Florida firefighter reveals a tale of secrets and infidelity.

A thump heard by children in their home one summer morning is the first clue in a shocking mystery.

Now exonerated, Eric Glisson discusses the 18 years he spent in prison for a murder he did not commit.

Rachel Buffett, whose ex-fiancé was convicted of two grisly murders, talks about the investigation.

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

Multiple suspects emerge when a retired corrections officer dies from antifreeze poisoning.

A model goes undercover to reveal the truth about a cold case involving a mom lost at sea.

Detectives track down the killer of a Las Vegas cocktail waitress and mother.

A 29-year-old woman goes missing.

The case of Johnny Hincapie, whose murder conviction was overturned after 25 years.

An abduction appears to have been a hoax until a similar case pops up.

An arrest is finally made five years after a mother of four disappeared.