Pogo the Clown or The Killer Clown | John Wayne Gacy, Jr. (March 17, 1942 – May 10, 1994)
John Wayne Gracy, also known as “Pogo the Clown” and “the Killer clown” raped and murdered 33 young boys in the course of six years. 27 of those bodies were found in the crawl space of his home after his arrest, more were eventually found in a nearby river. He was employed as a clown and worked as an entertainer at children’s birthday celebrations. He was killed in 1994 by means of lethal injection.
Sources
GQ
Herald Sun
Manolith
Wikipedia