People convicted of murder by Illinois

John Wayne Gacy was an American serial killer and sex offender who raped, tortured and murdered at least thirty-three young men and boys between 1972 and 1978 in Norwood Park Township, a suburb of Chicago, Illinois. He became known as the "Killer Clown" due to his public performances as a clown prior to the discovery of his crimes.

American kidnapper-murderer duo, committed "the crime of the century"

American upholsterer, radical labor activist, and newspaper editor (1855-1887)

American socialist and anarchist newspaper editor (1848–1887)

Richard Benjamin Speck was an American mass murderer who killed eight student nurses in their South Deering, Chicago, residence by stabbing, strangling, slashing their throats, or a combination of the three on the night of July 13–14, 1966. Speck also raped one victim before killing her. A ninth potential victim, student nurse Corazon Amurao, survived by hiding beneath a bed.

Scottish-Canadian serial killer

German anarchist and labor union (1858–1887)

American criminal (1928–2012)

American anarchist (1847–1922)

American serial killer (1952-1994)

German anarchist (1836–1887)

American activist (1850-1916)

American serial killer and rapist

American anarchist (1853-1898)

serial killers

American serial killer and necrophile

American serial killer (1955–2002)

American hitman

American mobster