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

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

“From the time the verdict was announced until we rolled Dateline on the East Coast, it was 10 hours,” Dennis Murphy tells Andrea Canning about last Friday’s all-new episode, “A Life Interrupted.” Listen to the Talking Dateline now: https://link.chtbl.com/td_alifeinterrupted | 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