A killer was on the loose… The full story tonight at 9/8c on a Dateline Weekend Mystery on NBC. | Dateline NBC

This week on a new Dateline: True Crime Weekly, we’ve got updates on the accused Gilgo Beach serial killer, the Florida grandmother accused of helping plan a murder, and a homicide investigation in the desert. Listen now: https://podcasts.apple.com/us/podcast/the-family-matriarchs-defense-a-landmark-decision/id1745566056?i=1000724861749 | 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

A diabolical murder plot and a series of betrayals, tonight on a Dateline Weekend Mystery at 10/9c. | Dateline NBC

Shifting stories. Lies piled upon lies. And an act of biblical betrayal that ended in murder... All that and more tonight at 8/7c on a Dateline Weekend Mystery. | Dateline NBC

It was a plot so sinister, so stunning, it took even seasoned detectives by surprise… Tonight at 9/8c on a classic Dateline Weekend Mystery on NBC. | Dateline NBC

“It was horrible. Worst thing I've ever seen.” The full story, tonight on an all-new 2-hour Dateline mystery at 9/8c on NBC. | Dateline NBC