Marg Helgenberger

Marg Helgenberger has filed for divorce from her husband, Alan Rosenberg, of nearly two decades, according to court documents.

The CSI star, who separated from Rosenberg near the end of last year, cited irreconcilable differences in documents filed Tuesday in Los Angeles. Helgenberger, 50, is also seeking spousal support while asking the court to deny any for Rosenberg, 58, the president of Screen Actors Guild.

At the time of their separation, Helgenberger's rep told People she and Rosenberg "love and respect each other and remain committed to their family."

Helgenberger and Rosenberg were married in 1989 and have one son together.