Marion Marshall's success as an actress began when she was a mere 17 years old. Marshall started her acting career landing roles in such films as the Gregory Peck dramatic adaptation "Gentleman's Agreement" (1947), the comedy "Apartment For Peggy" (1948) with Jeanne Crain and the comedy "Sitting Pretty" (1948) with Robert Young. She also appeared in "Unfaithfully Yours" (1948) and the Cary Grant comedy "I Was a Male War Bride" (1949). Her film career continued throughout the forties and the fifties in productions like "The Snake Pit" (1949) with Olivia de Havilland, "A Ticket to Tomahawk" (1950) and "Dancing in the Dark" (1950) with William Powell. She also appeared in "Stella" (1950). During the latter half of her career, she tackled roles in the drama "I Can Get It For You Wholesale" (1951) with Susan Hayward, the Dean Martin comedy "That's My Boy" (1951) and the Dean Martin comedy "Sailor Beware" (1952). She also appeared in the crime adaptation "I Want to Live!" (1958) with Susan Hayward. Marshall last acted in the mystery "Gunn" (1967) with Craig Stevens. Marshall was married to Robert Wagner.