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

Denise Brown and Kris Jenner remember Nicole Brown-Simpson’s carefree spirit and love of her children. | Dateline NBC

What happened when the Ford Bronco went from the freeway to O.J. Simpson’s driveway? Dateline all new Friday at 10/9c on NBC. | Dateline NBC

Ahead of next week's premiere of the new NBC show Timeless, we got to thinking... if you changed one moment in time, could you alter history? What about in the O.J. Simpson case? | 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