It is believed that Gacy performed all of these murders in his ranch house near Norridge.
Gacy murdered his first victim in the year 1972 and two more by the end of 1975.
He murdered at least 30 more victims after his divorce form his second wife in the year 1976.
Gacy was sentenced to death on March 13, 1980. He spent most of his painting before his death.
John Gacy has two kids named Christine Gacy and Michael Gacy.
Christine and Michael both were born to John's first wife Marlynn Myers.