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Walt Warren is a former inmate of Springfield Penitentiary.

Walt is generally a mild-mannered person, but was arrested for a minor offense and sentenced to a term in Springfield Penitentiary, where he had the misfortune of being cellmates with Sideshow Bob. Due to budget cutbacks, the city of Springfield announced that all minor offenders would be released from prison. Bob, hearing of this, noted the similarities in height and facial structure between himself and Walt and hatched a plan to escape and make another attempt to kill Bart Simpson. The night before the minor offenders' release, Bob knocked Walt out and performed facial transplant surgery, putting his own face and hair on Walt and vice versa. Then, the next morning when the minor offenders were set free, Bob simply walked out of prison in place of Walt (who was still unconscious from the surgery).