Once a Thief is a 1950 American crime film noir directed by W. Lee Wilder starring Cesar Romero, June Havoc, Marie McDonald and Lon Chaney Jr.

Plot Margie Moore, a miserable San Francisco woman, turns in desperation to jewel robbery. She narrowly escapes apprehension in a heist and moves to Los Angeles, where she takes an honest job as a waitress. Her troubles resume when she falls in love with smooth-talking Mitch Foster, who reveals his true colors by stealing all of her money and then informing the authorities about her.

In prison with her partner-in-crime Pearl, Margie is visited by Mitch and waitress friend Flo. Mitch continues to try to extract money from her. Margie overpowers a doctor and slips away from prison disguised in the doctor's clothes. Law-enforcement authorities look for her at Mitch's and discover his illegal activities there. Mitch tries to escape, but Margie lures him to a deserted spot and shoots him.

Cast Cesar Romero as Mitch Moore June Havoc as Margie Foster Marie McDonald as Flo Lon Chaney Jr. as Gus Iris Adrian as Pearl Jack Daly as Eddie Marta Mitrovich as Nickie Ann Tyrrell as Dr. Borden Michael Mark as Milton Kathleen Freeman as Phoebe Dana Broccoli as Jane (as Dana Wilson) Bill Baldwin as bondsman Lieutenant Francis Blumfeld as himself Deputy Gwendolph Dusuau as herself Chaplain John P. Battema as himself Deputy Dorris Mack as herself Deputy Irma Kunow as herself Officer Lloyd C. Smith as himself Sergeant Ruth Moore as herself Deputy Leauta Larsen as herself

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