A serial killer's reign ended over a discarded pizza crust. This is how it happened. Imagine the panic in Los Angeles. The Grim Sleeper vanished for years between murders. Detectives suspected Lonnie Franklin Jr. but lacked DNA proof. In a bizarre 2010 undercover operation, a cop posing as a busboy cleared his order, snatching Franklin's half-eaten slice. That crust caught him, securing his arrest. And if you want to go deeper, watch the Night Stalker video right now.