Did You Know?
He made an uncredited appearance as himself - he was working as a Radiologist's Assistant at the time - in William Friedkin
's The Exorcist
(1973). Several years later, Friedkin - during production of Cruising
(1980) - visited Bateson in prison after he had confessed to several murders, with Bateson serving as an uncredited consultant on the film, which dealt with a serial killer targeting gay men.