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

He was happy, he loved her... Dateline Weekend Mystery tonight at 8/7c. | Dateline NBC

Where does performance end and reality begin? Tonight, on an all-new Dateline at 9/8c. | Dateline NBC

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