CSI star Marg Helgenberger has filed for divorce from her husband, one-time LA Law and The Guardian actor and current Screen Actors Guild president Alan Rosenberg.

The 50-year-old Emmy winner, who plays Catherine Willows on the popular forensic crime drama, cited irreconcilable differences in her divorce petition, filed on Tuesday in Los Angeles, the Associated Press reports.

The couple met and married in 1989. They have one son.