Dateline

A mother in Pennsylvania disappears after co-workers see her leaving for lunch.

Compelling mysteries, powerful documentaries, in-depth investigations.

An investigation begins after a young pregnant mother disappears in Virginia.

Years after a law student is murdered, renewed attention leads to an arrest and a courtroom twist.

Compelling mysteries, powerful documentaries, in-depth investigations.

When police respond to a report of a break-in, they discover a woman was murdered.

Latest developments and new interviews in the case of children's grief author Kouri Richins.

When a firefighter is killed, the murder investigation unravels a web of secrets.

A former MLB pitcher is at the center of a murder investigation after his in-laws are targeted.

A young Tennessee woman mysteriously vanishes; determined to find her, her family takes action.

Compelling mysteries, powerful documentaries, in-depth investigations.

A mother of two who vanishes during a storm turns out to be a victim of something sinister.

Never-before-seen interview footage of the au pair in the Virginia double murder case is revealed.

A former ballerina shoots her husband in what she alleges is an act of self-defense.

In her first interview since Nancy Guthrie disappeared, "Today's" Savannah Guthrie speaks out.

Tech titan Bob Lee is stabbed to death in San Francisco; what really happened under the Bay Bridge?

A wealthy podiatrist and his girlfriend plot to hire a hit man to kill his wife.

A years-long international hunt after a professor is found murdered in her Maryland home.

Detectives investigate the disappearance of a mother of two who feared she was being stalked.

A Georgia man's death is quickly ruled a suicide; his family believes there is more to the story.

After an Oregon chef is murdered, investigators uncover a potential clue written years earlier.

After an Oregon chef is murdered, investigators uncover a potential clue written years earlier.

A murder unearths an unsolved mystery from years earlier and a long-hidden truth surfaces.

A nurse is killed; detectives think they have a suspect until new information redirects them.