John Wayne Gacy murdered at least thirty-three young men and boys in Norwood Park Township, Illinois, a suburb of Chicago. Gacy committed all of his known murders inside his ranch-style house. The investigation into the disappearance of Robert Piest led to Gacy's arrest on December 21, 1978. He was sentenced to death on March 13, 1980; he was executed by lethal injection on May 10, 1994.