When 18-year-old Anjelica 'AJ' Hadsell disappears, the investigation into her inner circle reveals a sinister betrayal.

When 19-year-old Anton Black dies while being taken into police custody, the community seeks justice. A yearlong Dateline investigation looks at missed warning signs and the officer at the center of the case.

The investigation into a newlywed's murder starts with a widow and ends with a possible serial killer.

Detectives in Portland, OR, discover a puzzling connection between the 2018 murder of chef Dan Brophy and a blog post written years earlier titled How to Murder Your Husband.

A 40-year-old Minnesota wife and mother, Janet 'Jan' Kruse, is shot to death in her bed while her husband Chris and teenage daughter Bailey are home, leaving investigators to wonder who would want her dead.

Flight instructor Kelsey Berreth vanishes after she was last seen grocery shopping with her daughter on Thanksgiving in Woodland Park, CO; the case makes national headlines, but the secret behind Kelsey's disappearance is lurking much closer to home.

College student Jesse Valencia is found murdered in a residential neighborhood in Columbia, MO; the police search for the truth, and they are stunned to learn that one of their own might be involved.

The mystery of a surgeon's whereabouts remains unanswered for five years after he disappears while on vacation with his wife, leaving behind financial ruin and mounting malpractice suits.

Eleven years after Waterbury, CT mother Donna Palomba is raped in her home while her children slept in 1993, investigators finally track down her attacker. Donna speaks out about the case, including her fight to keep her assailant from walking free.

In Stephenville, TX, in 1987, Susan Woods doesn't show up for work for 2 days; she is discovered by her father dead at home in her bathtub. As police search for answers, they find a trail of victims - men associated with Susan, including her estranged husband living in Indianapolis. But the case wasn't solved for almost 2 decades.