Happy's Place premieres TONIGHT at 8/7c on NBC and streaming on Peacock. | NBC

It was quite obvious to the medical examiner that this was a deliberate, determined killing... The full story tonight at 9/8c on a Dateline Weekend Mystery. | Dateline NBC

An extraordinary journey through the criminal justice system was just beginning... The full story tonight at 9/8c on a Dateline Weekend Mystery. | Dateline NBC

Diane was suddenly the unlikely center of a strange and disturbing mystery… Her story tonight on a classic 2-hour Dateline Weekend Mystery at 9/8c on NBC. | Dateline NBC