William Petersen agrees to 'CSI' return

William Petersen has agreed to return for a ninth season of CSI: Crime Scene Investigation.

The star pulled out during the last run to take an on-stage role and he wants to return to the play this year.

However, The Hollywood Reporter said that after "lengthy negotiations" he would appear in a reduced number of episodes.

Petersen has been a fixture since the show began and is also an executive producer.