Dateline

Investigators search for a New Mexico mechanic who has been missing for eight years.

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

A mother who seemed to be happily married is found dead in her backyard spa.

A professional poker player's gamble may have resulted in a murder.

Authorities investigate a car crash that left a pregnant woman and her son dead.

The mysterious 2005 disappearance of Ray Gricar, a district attorney in Pennsylvania.

Detectives reopen a case involving the murder of a man who was part of a love triangle.

Investigators find an unlikely suspect in a woman's death.

A woman seeks justice for her 18-year-old daughter, who was raped and murdered in an Anchorage state park in 1994.

Police suspect a woman's estranged husband in her stabbing death, but surveillance video shows he was not at the scene.

Two years after the disappearance of his wife, Josh Powell kills his two sons and himself.

Keith Morrison reports on a dramatic undercover operation in Palm Beach, Florida to save a wife and mother who had no idea she was in danger.

A man with a surprising motive shoots a father in broad daylight.

Michelle Young was pregnant when she was brutally murdered while her husband was away.

A woman finds herself on the wrong side of the law after she accuses her boyfriend of rape.

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

Investigating the connection between an attack and a woman's disappearance in nearby Denver.

Investigators are suspicious when a wealthy former radio DJ mysteriously disappears from his yacht in the Pacific Ocean.

Years after a college student is murdered in her condo, calls to the police lead to the case being reopened and solved.

Officials identify a man's remains more than 20 years after his mysterious disappearance.

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.

Investigating the mysterious murder of a family patriarch.

A cold-case investigator helps police determine what happened to a missing woman.

Detectives find a message written in blood during a murder investigation.

A risky undercover operation in a rough prison could expose a suspected serial killer's secrets.