Christopher was 84 years old and died of non-lung small cell carcinoma, according to his son John.
While in school he fenced and played soccer, and was a member of the glee club.
George Morgan played Father Mulcahy in the pilot episode only, then he was replaced by Christopher who portrayed the role for the entire 11-year run, and then continued in the part for two years on the spin-off AfterMASH.
Christopher also had to learn to box to play the role, as Mulcahy was an amatur boxer.
During his life, Christopher gave much of his time to the National Autistic Society, in honor of his son Ned who is on the autism spectrum.