John Wayne Gacy Jr. was a criminal.
John Wayne Gacy Jr. -LRB- March 17 , 1942 -- May 10 , 1994 -RRB- was an American serial killer and rapist.
A serial killer is typically a person who murders three or more people , usually in service of abnormal psychological gratification , with the murders taking place over more than a month and including a significant break -LRB- a `` cooling off period '' -RRB- between them.
