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Dorothy Tree (born Dorothy Estelle Triebitz, May 21, 1906 – February 13, 1992) was an American actress, voice teacher and writer. She appeared in a wide range of character roles in at least 49 films between 1927 and 1951. Her roles included Martha, mother of Knute Rockne in Knute Rockne, All American, and May Emmerich, the invalid wife of Louis Calhern in The Asphalt Jungle. Wikipedia