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" WIlliam Petersen will return to CSI for another cameo appearance this season, according to co-star George Eads. The actor told TV Guide that Petersen will reprise his role as Gil Grissom for Marg Helgenberger&amp;#039;s final scenes as Catherine Willows. Eads, who plays Nick Stokes on the CBS drama, said: &amp;quot;He told me he&amp;#039;s going to come back this season to help us with Marg&amp;#039;s exit.&amp;quot;  Petersen originally left CSI in 2009 but returned for an uncredited cameo in the show&amp;#039;s 11th season earlier this year. CSI producer Carol Mendelsohn recently hinted that Petersen could return for another guest stint, claiming that he is invited back to the programme &amp;quot;every year&amp;quot;. Mendelsohn also confirmed that Marg Helgenberger&amp;#039;s Catherine Willows will get an &amp;quot;action hero&amp;quot; exit when the character departs mid-way through the upcoming 12th season. The new run will see Ted Danson joining the cast as lead investigator DB Russell, replacing  the absent Laurence Fishburne. CSI returns to CBS on Wednesday, September 21. Watch William Petersen&amp;#039;s cameo in the last season of CSI below:      "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/ustv/news/a336412/william-petersen-returning-to-csi-claims-co-star-george-eads/>