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

Finish off the year with a good laugh! Join us for A Toast to 2024 on New Year’s Eve at 9/8c on NBC. | Dateline NBC

Ahhh, the warm fuzzy feeling of justice... Dateline's Keith and Josh will be on A Toast to 2024, Tuesday at 9/8c on NBC. | Dateline NBC

Join the TODAY Show gang as they celebrate the end of a crazy year... Tonight at 9/8c on NBC's A Toast to 2024. | Dateline NBC