1. The Trigger

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. 25 March 2021. 48 min

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.

2. Warning Signs

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. 25 March 2021. 54 min

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.

3. Horrific Acts

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. 25 March 2021. 51 min

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

4. By Reason of Insanity

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. 25 March 2021. 48 min

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

5. You Have to Dig

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. 25 March 2021. 55 min

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

6. It Never Ends

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. 25 March 2021. 52 min

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