Alan Alda Pens Sweet Tribute to Late M*A*S*H Costar William Christopher Alan Alda remembered his pal and M*A*S*H costar William Christopher in a Twitter post on Sunday, just one day after the actor died from cancer. “His pals from #MASH miss Bill powerfully. His kind strength, his grace and gentle humor weren’t acted. They were Bill. #WilliamChristopher,” Alda, 80, tweeted. Christopher died at 5:10 a.m. PT on Saturday morning with his wife, Barbara, at his side. He was 84. A rep for the star told PEOPLE that he died “peacefully” and was “not in pain.” Christopher’s son, John, told ABC that the actor died from a non-small cell lung carcinoma at his home in Pasadena, California. John said Christopher was diagnosed with cancer a year and a half ago and had begun a new treatment last month before his health deteriorated. He entered hospice care on Monday, Dec. 26. Christopher played Father John Mulcahy on M*A*S*H alongside Alda who played Capt. Hawkeye Pierce.. Please subscribe to get the latest video Thank you very much. I love you!