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John Joseph Dullaghan III (November 27, 1930 – January 18, 2009) was an American film, stage and television actor. He was known for playing the role of Dr. Wilker in the American science fiction television series Battlestar Galactica. Dullaghan was born in Brooklyn, New York. He guest-starred in television programs including Gunsmoke, The Rockford Files, Barnaby Jones, B. J. Wikipedia