The evidence is in and it's irrefutable: Grissom will remain on the CSI beat for at least one more season — albeit with an asterisk.

Sources confirm to me exclusively that William Petersen — whose pact with the show was set to expire in May — has agreed to stick around through the 2008-09 TV season (and perhaps beyond). Although the specifics of his new deal were not disclosed, a CSI insider tells me it's both lucrative (read: $$$) and brimming with "out" clauses (read: the asterisk I spoke of earlier).

In fact, Petersen already has his first "out" lined up: This fall, the actor will return to the stage in Conor McPherson's A Dublin Carol, which kicks off a six-week run in his hometown of Chicago in mid-November. As you'll recall, Petersen missed four episodes of CSI in early 2007 to headline a Rhode Island production of Dublin Carol. Shakespearean thesp Liev Schreiber stepped in to fill the Grissom void, only to get shot to death in his final episode.

http://community.tvguide.com/blog-entry/TVGuide-Editors-Blog/Ausiello-Report/Ausiello-Scoop-William/800036581

Now hopefully the rest of the cast will also sign back up for another season!! It wouldn't be the same without the others there too! We've already lost Sara!! We can't loose another one!!