Mary Todd Andrews, 86, an actress and the widow of screen star Dana Andrews, died Jan. 17 in Palm Springs of Alzheimer’s disease. Born and reared in Santa Monica, she studied acting and became a leading comedic actress and ingenue at the Pasadena Playhouse in the 1930s. There she met the recently widowed Andrews, who had hitchhiked from Houston and was studying to become an actor. They were married in 1939 at the home of her parents, the J.W.