William Petersen by Robert Voets/CBS William Petersen by Robert Voets/CBS

I think I hear CSI fans everywhere screaming. We teased casting changes for the CBS drama in a recent Mega Minute, and alas, those changes include William Petersen, whose recently signed contract only guarantees his appearance until the upcoming season's 10th episode, a rep for CBS confirms, following a report from EW's Ausiello.

Petersen isn't gone for good, though. He will be staying on as an executive producer, and has agreed to make special appearances throughout the remaining run of the series. This marks the third original cast member to leave the show, following Jorja Fox and Gary Dourdan's departures last season.

Producers, however, promise a memorable exit for Grissom (including Fox's return next season for a multi-episode, Grissom-Sidle arc) and some exciting changes in the show's future. "We're out to add new characters to the show, and the show will change as a result," said exec producer Carol Mendehlson. "But that's a good thing."

So, how do you feel about Petersen's choice to become only a part-timer? - Adam Bryant