Mary Loomis was the daughter of Lila and Sam Loomis. She grew up hearing horrible stories from her mother about Norman Bates and how Bates had killed Mary's aunt, Marion Crane. As a young woman, Mary became a psychology student. After Norman Bates was released, Lila Loomis convinced Mary to help her make Norman go mad once again. Mary took a job as a waitress at Statler's Diner. She worked there for four days before Norman also started working there. In that time she said she had broken a dozen dishes.