Gary Dourdan left CSI in season 9, and here is why Warrick Brown left CSI: Crime Scene Investigation. CSI debuted on CBS in 2000 and follows a team of investigators who use science to solve murders or other crimes. The show's use of science and its likable cast of characters saw it become one of the biggest shows in the world during its run. Fans were confused when Warrick died in CSI season 9. The show came to an end after 15 seasons in 2015, and the cancelation of CSI: Cyber in 2016 marked the end of the franchise — until the revival series. Unfortunately for fans of the original CSI, Warrick's death happened in the middle of the show.
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