His son, John Christopher, said the actor died from non-lung small cell carcinoma at his home in Pasadena.
He was 84.
From left to right: Loretta Swit, Mike Farrell, Jamie Farr, Harry Morgan, Alan Alda and William Christopher during the taping of the final episode of "*M*A*S*H" in January 1983.
The actor played the role of Father John Mulcahy on "M*A*S*H" from 1972 to 1983 and in the follow-up series "After M*A*S*H*" from 1983 to 1985.
He also had parts in the movies "The Fortune Cookie," "With Six You Get Eggroll," and the TV show "Gomer Pyle, U.S.M.C."
From left to right: William Christopher, Harry Morgan, Mike Farrell, Alan Alda, and Jamie Farr, take a break on the set of "M*A*S*H" in Los Angeles on Sept. 15, 1982.
William Christopher leaves behind his wife Barbara and his sons John and Ned.
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