John Wayne Gacy Typewriter displayed at the National Museum of Crime & Punishment, Washington, D.C. "Notorious Typewriter" Gacy "The Clown Killer" used this typewriter to type his legal papers and his book "A Question of Doubt", which was written in 1984. Also shown is a (copy) of the original property receipt for this typewriter indicating his prisoner number (# N00921), along with the rules and regulations that come with possessing personal property while incarcerated at Statesville Correctional center in Joliet, Illinois. Gacy is listed in the Guinness Book of World records for the longest sentence imposed on a mass murderer; he was given 21 consecutive life sentences and 12 death sentences.