The missing persons case had just taken a tragic turn... More tonight on a Dateline Weekend Mystery at 9/8c. | Dateline NBC

Two murders. Three Trials. One killer. Watch it all unfold tonight at 9/8c on an ALL-NEW Dateline mystery… | Dateline NBC

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

Meghan was funny, popular, eager to please… Watch an all-new two-hour Dateline Friday at 9/8c on NBC. | Dateline NBC

Her friend says Diane turned around and said, "Tex, what did you do?" It’s an all-new Dateline tonight at 10/9c with Josh Mankiewicz on NBC. | Dateline NBC

Sometimes, plans don't always go just the way you'd expect... Watch tonight at 9/8c on a classic Dateline. | 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