Copyright 2007 Mark Mainz / Getty Images

As ET confirmed on Monday, Laurence Fishburne is joining the cast of "CSI: Crime Scene Investigation." What he isn't doing -- at least not initially -- is replacing William Petersen's character, Gil Grissom, as head of the CSI unit. Rather, Fishburne, whose character has yet to be named and is simply called "The Professor" right now, will be joining the team as a CSI Level 1, which is an entry level for the job.

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Copyright 2007 Mark Mainz / Getty Images

It's official! Laurence Fishburne will join the cast of "CSI: Crime Scene Investigation" this season.

As previously reported, William Petersen is leaving the hit CBS drama "CSI," but sources tell ET this does not signal the end of the series, which continues to be one of the top rated shows on CBS. The actor, who plays detective Gil Grissom, will exit the show at midseason, with the 10th episode of the upcoming season being his last as a regular cast member.

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