Actor Donald Douglas came to Hollywood in 1934 to play the small role of "Mac" in the film version of Sidney Kingsley's Men in White (1934). Though occasionally a villain, the Scottish-born Douglas was usually cast in bland good-guy roles (e.g. his portrayal of the dull detective at odds with Dick Powell's Philip Marlowe in 1944's Murder My Sweet). One of his few leading roles in film was the title character in the Columbia serial Deadwood Dick (1940). Douglas was given more of a chance to shine on radio; in the 1943 Mutual network mystery anthology Black Castle, Douglas played all the parts, including the announcer. Donald Douglas died suddenly at the age of 40, not long after completing work on Gilda (1946), in which he played Thomas Langford.