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

More twists than a pretzel… The all-new 30th season of Dateline starts FRIDAY at 9/8c! | Dateline NBC

New Dateline swag, featuring YOU! Add your name and use the code DATELINE30 for 30% off the Dateline collection through 9/28/2021 at 11:59 p.m. ET. Shop here: https://www.nbcstore.com/collections/dateline | Dateline NBC

None of it made sense… What happened on that cold, brutal morning? Find out tonight at 9/8c on a classic Dateline on NBC. | Dateline NBC