Known as the "Killer Clown," what murderer gave us nightmares long before Stephen King's It?

Clowns are scary on their own merit, but John Wayne Gacy made them even more terrifying. The serial killer dressed as a clown for children's parties, but on his own time, he's believed to have killed 33 victims, mainly young men. In 1994, he was executed by lethal injection.

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