Sean Smith
March 26, 2009 AT 06:33 AM EDT

Marg Helgenberger, star of the CBS series CSI has filed for divorce from her husband, Alan Rosenberg, the president of the Screen Actors Guild, the Associated Press reports. Helgenberger, 50, filed her petition for divorce in Los Angeles on Tuesday, citing irreconcilable differences. The two actors were married in 1989, and have one son. As president of SAG, Rosenberg, 58, has been engaged in a protracted battle over the last year with Hollywood producers, attempting to negotiate a new SAG labor contract. 

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