Appearing in bit parts in several of the studio's more successful films, Morris was signed to a Metro-Goldwyn-Mayer contract in 1941. For one of her early film roles, Cry 'Havoc' (1943), she affected a British accent. Her next picture was the well-received drama The Human Comedy, which featured a star cast, headed by Mickey Rooney, Frank Morgan, James Craig and Marsha Hunt. Morris' role was Mary Arena; the girlfriend of Van Johnson's character. The highlight of her career, however, came in 1945 when she starred as the doomed Ingeborg Jensen in Our Vines Have Tender Grapes. Other screen roles included Someone to Remember (1943), Pilot No. 5 (1943), Rationing (1944) and None Shall Escape (1944).
Morris was married twice. Her first marriage was to math professor Marvin Moffie in 1943. They had two children. The marriage ended in divorce in 1966. Her second marriage was to church minister Roger E. Miller in 1969, but their union was short-lived and ended in a 1972 divorce.
Morris is often remembered for her featured appearances in MGM short subjects. She appeared in several of the studio's short films including the Pete Smith Specialties, The Passing Parade, and Crime Does Not Pay series. The Crime short turned out so well that MGM expanded it into a full-length feature, Main Street After Dark in 1945, for which the Actress was billed as Dorothy Ruth Morris. (Morris reminisces about her short-subjects experience in the Turner Classic Movies documentary Added Attractions: The Hollywood Shorts Story, first broadcast in 2002.)
Morris resided in Palm Springs, California until her death on November 20, 2011 at the age of 89. Upon her passing, her body was donated to medical science at the University of California Riverside.
