William Petersen and Jorga Fox are leaving CSI: Vegas, the last installment in the long-running police procedural franchise. The return of Jill Grissom and Sarah Seidl was a huge selling point in their first recovery season, but they won’t stay that way for long. Petersen only signed on for the first ten-episode season, and Fox later left the show, saying she couldn’t bring herself to break up Grissom and Sidle after all these years. So when veteran Marge Helgenberger returns to her role as Catherine Willows, she’ll step in to…
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