Investigators walked into a mystery that would turn their world upside down… Watch tonight at 9/8c on a 2-hour Dateline Weekend Mystery on NBC. | Dateline NBC

Tonight on a new Dateline, the latest chapter in this hair-raising tale, featuring new evidence, explosive testimony and the prosecution's new star witness. Watch at 9/8c on NBC. | Dateline NBC

A medical mystery was about to turn into a full-on police investigation… Tonight on an all-new Dateline at 10/9c on NBC. | Dateline NBC

A lot of suspicions, but no evidence. And certainly no witnesses. Except one… tonight on Dateline with Josh Mankiewicz at 9/8c on NBC | Dateline NBC

It was a detective's nightmare, with no suspects in sight. Until... More tonight on an ALL-NEW 2-hour Dateline at 9/8c with Keith Morrison. | Dateline NBC

You've heard the story. Now you can see it... Friday on an all-new Dateline mystery at 9/8c. | Dateline NBC

Thirty-two years ago this month, a series of murders began near and along Virginia’s Colonial Parkway. When it was over, four couples were dead at the hand of what authorities believe could be a serial killer. The crimes were dubbed “The Colonial Parkway Murders.” | Dateline NBC