Dateline NBC

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.

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.

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

An investigation into the murder of a beloved 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 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.

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

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

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

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