George Ralph DiCenzo (April 21, 1940 – August 9, 2010) was an American actor, and one-time associate producer for Dark Shadows. He was in the show business for over 30 years, with extensive film, TV, stage, and commercial credits. DiCenzo notably played Marty's grandfather Sam Baines in the film Back to the Future. He also had a minor role in William Peter Blatty's The Exorcist III.…