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Marilyn is Charles Westmoreland's pet cat. (1x1) A grandfather clause in the prison's policy allowed Westmoreland to keep Marilyn. The DOC had repeatedly attempted to transfer Westmoreland to other facilities, though he was unwilling to leave Marylin behind and became adept at using legal loopholes to block his transfers. (1x5)
- Both Marilyn and Charles Westmoreland were killed by Brad Bellick.
- This is the only animal to die in Prison Break.