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William Horatio Powell (April 29, 1892 – November 5, 1984) was an American actor. He appeared in more than 130 films between 1918 and 1975. He is best known for his portrayal of Nick Charles in the Thin Man series of films, and for his romantic pairings with Myrna Loy in such films as The Thin Man (1934), After the Thin Man (1936), and The Thin Man Goes Home (1944).