BONUS: John Wayne Gacy (Mark of a Serial Killer)

We are bringing you a special bonus episode featuring a case from Oxygen's hit series, “Mark of a Serial Killer.” Watch Mark of a Serial Killer on Sundays at 7/6c on Oxygen! A rash of young men goes missing around Chicago during the 1970s; when bodies start washing up in the river, a pattern emerges; a small piece of evidence leads police to the home of a model citizen, where his furnace puts the suspect in the hot seat. Season 2, Episode 5 Originally aired: May 7, 2020 Watch full episodes of Mark of a Serial Killer live or OnDemand for FREE on the Oxygen app: https://oxygentv.app.link/MOASKPodcast See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.