24 Hours in Police Custody: Season 14, Episode 2

14 - 2: Murder Is No Game (Part 2)

Detectives from the Major Crime Unit have a suspect in custody but they're shocked when what their investigation reveals is even more devastating and important than their worst fears. Forensic analysis of his life online demonstrates that he craved notoriety by becoming the most deadly mass school shooter in history, and that he had based his plans on what he had found online about other school shooters.