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

It was quite obvious to the medical examiner that this was a deliberate, determined killing... The full story tonight at 9/8c on a Dateline Weekend Mystery. | Dateline NBC

Blood everywhere — the kitchen, the hallway, the back door. And a singular command: “Get the hell out of the house.” Blayne Alexander has the full story tonight at 9/8c on an all-new 2-hour Dateline on NBC. | Dateline NBC

Shots had been fired. So Averill called 911… Dateline Weekend Mystery 9/8c tonight. | 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

The mystery of what happened to Jay Lee would haunt an entire community, and reveal a most unlikely suspect… Watch tonight at 9/8c on an all-new 2-hour Dateline with Blayne Alexander. | Dateline NBC

The mystery of who killed Anita was only just beginning… Her story tonight at 9/8c on an all-new Dateline with Blayne Alexander. | Dateline NBC