In 1979, whilst The First Great Train Robbery was on general release, Butterworth was starring as Widow Twankey in the pantomime Aladdin at the Coventry Theatre. When the show had finished, he went back to his hotel following the evening's performance. His failure to return for the following day's matinee show caused alarm, and he was found dead in his room from a heart attack. The remainder of the pantomime's run was cancelled as a mark of respect. Butterworth was buried in Danehill Cemetery, in East Sussex. Following his death, the Producer of the Carry On films, Peter Rogers, said that Butterworth was "a thoroughly nice bloke and a dear friend".