Watch the full episode of People Magazine Investigates After Show: The Long Island Serial Killer, available now, on the new People/Entertainment Weekly Network (PEN). Go to http://people.com/pen/ or download the PEN app on your mobile or connected devices. | Investigation Discovery

"There was an affair, there was fire, there was murder." We'll be watching the season premiere of People Magazine Investigates tonight at 10/9c, will you? | Investigation Discovery

From chilling confessions to shocking discoveries, the new season of "People Magazine Investigates" pulls back the curtain on crimes that gripped the nation. This season, the truth is more disturbing than ever. The new season of "People Magazine Investigates" premieres January 12 on ID. #PeopleMagazineInvestigates @peoplemag | Investigation Discovery

They went looking for 1 body… and they found 4 more. Watch People Magazine Investigates featuring the Long Island Serial Killer for FREE on ID GO. | Investigation Discovery

Next week we explore the case of the ‘Railroad Killer.’ Join us for a new episode of People Magazine Investigates: Surviving A Serial Killer Sunday at 9/8c on ID and streaming on Max. People | Investigation Discovery