E1 - The Trigger

Aired: March 25, 2021

The disappearance of a teenage boy in Chicago sends investigators to the home of contractor John Wayne Gacy; a team of officers track his every move until a chance encounter leads to a horrifying discovery in the crawl space of Gacy's home.

E2 - Warning Signs

Aired: March 25, 2021

An examination of Gacy's past reveals unsettling evidence that authorities knew he was a sexual predator; still, Gacy was able to evade law enforcement for more than a decade as he committed his deadly crimes.

E3 - Horrific Acts

Aired: March 25, 2021

Gacy details his murders in a chilling confession as police uncover the scope of his crimes.

E4 - By Reason of Insanity

Aired: March 25, 2021

The jury must decide between sending Gacy to a psychiatric facility or condemning him to a death sentence.

E5 - You Have to Dig

Aired: March 25, 2021

A quick verdict doesn't end the story; the specter of more victims has investigators digging again.

E6 - It Never Ends

Aired: March 25, 2021

Questions about the Gacy case linger 40 years later, as does the fallout from his terrible crimes.