Catherine Willows has been with the CSI team since day one of the wildly popular series, but tonight the crime-scene investigator will turn over her badge for good when she uncovers a terrifying plot to destroy her. Elisabeth Shue Joins 'CSI' Cast Reflecting on her life and career, the final episode of Marg Helgenberger's three-part goodbye has Catherine exploring her somewhat unsavory past to get to the root of a mysterious scheme to squeeze her out of the LVPD.
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