At the police station, a psychiatrist explains that Norman killed his mother and her lover ten years prior out of jealousy. Unable to bear the guilt, he mummified his mother's corpse and treated it as if she were still alive. He recreated his mother as an alternate personality, as jealous and possessive towards Norman as he felt about his mother. Whenever Norman is attracted to a woman, "Mother" takes over. Under the "Mother" personality, Norman killed two women before he killed Marion and Arbogast. The psychiatrist concludes that "Mother" has now submerged Norman's personality. Norman sits in a jail cell and hears his mother's voice stating the murders were his doing. Meanwhile, Marion's car, which contains her remains and the stolen money, is retrieved from the swamp.
At the police station, a psychiatrist explains that Norman killed his mother and her lover ten years prior out of jealousy. Unable to bear the guilt, he mummified his mother's corpse and treated it as if she were still alive. :He recreated his mother as an alternate personality, as jealous and possessive towards Norman as he felt about his mother. Whenever Norman is attracted to a woman, "Mother" takes over. Under the "Mother" personality, Norman killed two women before he killed Marion and Arbogast. The psychiatrist concludes that "Mother" has now submerged Norman's personality. Norman sits in a jail cell and hears his mother's voice stating the murders were his doing. Meanwhile, Marion's car, which contains her remains and the stolen money, is retrieved from the swamp.