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

The first episode of the ALL-NEW Dateline podcast, Dateline True Crime Weekly with Andrea Canning, is out now! Listen for free, wherever you get your podcasts: https://link.chtbl.com/dl_tcw_0516 | Dateline NBC

The investigation of Jane Bashara's death was ramping up and, for the first time, the detectives will take you through it all, step by step... Tonight, on a new Dateline 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

More on John and Lauren's Hidden True Crime podcast | Dateline NBC