Marion Marshall's success as an actress began when she was a mere 17 years old. Marshall began her acting career with 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). She kept working in film throughout the forties and the fifties, starring in the drama "The Snake Pit" (1949) with Olivia de Havilland, the comedy "A Ticket to Tomahawk" (1950) with Dan Dailey and the adaptation "Dancing in the Dark" (1950) with William Powell. She also appeared in the Ann Sheridan drama "Stella" (1950). Film continued to be her passion as she played roles in the Susan Hayward drama "I Can Get It For You Wholesale" (1951), "That's My Boy" (1951) and "Sailor Beware" (1952). She also appeared in "I Want to Live!" (1958) with Susan Hayward. Marshall more recently acted in the mystery "Gunn" (1967) with Craig Stevens. Marshall's husband was Robert Wagner.