The Warrens claim to have exorcised a "werewolf demon" on June 17, 1983. The subject of the case, Bill Ramsey, had bitten several people, believing himself to be a wolf. The events surrounding this case were later described in a 1991 book written by the Warrens, Werewolf: A True Story of Demonic Possession. No photos or video evidence were available to confirm the possibility and reasoning that Bill Ramsey was, indeed, possessed by a werewolf-type demon or evil spirit.