Marylou is Dean's young, flirtatious first wife. Dean meets her in a diner after being released from the reformatory and falls in love with her. Marylou continues to have a relationship with Dean after he divorces her to marry Camille. After the divorce, Dean picks her up in Denver when he decides to meet Sal in Virginia. She travels with them to New Orleans and on to San Francisco. She has an affair with Sal after Dean leaves them on a sidewalk in San Francisco, but she leaves him because he can't support her. Even after marrying Camille, Dean stalks Marylou in San Francisco. He watches her bring home a different sailor every night. Marylou finally marries a used-car dealer. The last time Dean sees her, he gives her a gun and asks her to kill him. When she refuses, he attempts to strike her and breaks his thumb.
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