Dateline

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.

A house fire in South Texas kills Patricia Leigh Mills while her young son miraculously escapes.

Firefighters make a grisly discovery while responding to a house fire in a Toronto suburb.

Compelling mysteries, powerful documentaries, in-depth investigations.

A quiet night in Texas turns deadly when gunfire erupts at the home of local business owners.

The homicide of soldier and young mother Karlyn Ramirez; a glimpse into the FBI's crime lab.

Law enforcement investigate a deadly explosion at a Southern California day spa.

A high school senior is found dead in her car after visiting the mall days before Christmas.

New details and interviews about the murder of a pro cyclist.

A family is rocked when a fatal accident reveals itself to be something much more disturbing.

Police discover a woman sitting on her husband's blood-covered body in their Iowa farmhouse.

A pregnant woman vanishes before her own baby shower; her worried family raises the alarm.

The California man finds himself the focus of a police investigation when his father goes missing.