What compeled a teenager to aid one of America’s most sadistic serial killers? For the first time in half a century, Elmer Wayne Henley Jr. breaks his silence. "The Serial Killer’s Apprentice" unravels his disturbing alliance with Dean Corll—better known as the Candyman Killer. Watch on ID or stream on HBO Max on September 17. | Investigation Discovery

When it comes to murder, nothing is impossible. Joe Kenda is coming back to ID with all-new "American Detective" tomorrow night at 10/9c on ID | Investigation Discovery

When a close-knit community reunited for their annual tradition, no one could have imagined the tragedy that awaited them the next day. Valerie’s disappearance shattered the festivities, and a grim discovery confirmed everyone’s worst fears. Tune into an all-new episode of Murder Under The Friday Night Lights on Wednesday at 10/9c on ID. | Investigation Discovery