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

Tonight on an all-new #Dateline, a woman makes a phone call naming her killer right before her death, which leads to his arrest, but 2 trials and 12 years later, authorities question if he was actually the victim and not the villain. Watch #Dateline on NBC4 tonight at 9 p.m. PREVIEW: https://nbc4i.co/3ggjAqt #TrueCrime #TrueCrimeCommunity #DontWatchAlone | NBC4

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

It’s a story about a red-hot Texas passion and a bitter feud... And tonight at 10/9c on Dateline, there’s a whole new chapter. | Dateline NBC