Marg Helgenberger arrives at the 135th Kentucky Derby at Churchill Downs Saturday, May 2, 2009, in Louisville, Ky.

Marg Helgenberger's Decade on "CSI"

Actress Marg Helgenberger from "CSI: Crime Scene Investigation" accepts the award the show won for favorite television drama series at the 30th Annual People's Choice Awards Sunday, Jan. 11, 2004, in Pasadena, Calif.

Helgenberger has won two Emmys for her role on "CSI."

Marg Helgenberger's Decade on "CSI"

Actor William Petersen, departing star of "CSI: Crime Scene Investigation," gets a kiss from his co-star Marg Helgenberger at dedication ceremonies for Petersen's star on the Hollywood Walk of Fame in Los Angeles Tuesday, Feb. 3, 2009.

Marg Helgenberger's Decade on "CSI"

In this image released by Milk Processor Education Program, Marg Helgenberger from the hit CBS television series "CSI," is latest celebrity to join the national Milk Mustache campaign. The actress and mom is setting the stage for a new campaign saluting moms nationwide for playing the important role of nutritional gatekeeper.

Marg Helgenberger's Decade on "CSI"

Marg Helgenberger joins with striking members of the Writers Guild of America (WGA) as they wrap yellow crime scene tape around the Alliance of Motion Picture and Television Producers (AMPTP) headquarters to look like a "crime scene" in Encino, Calif., Tuesday, Dec. 18, 2007.

Marg Helgenberger's Decade on "CSI"

Marg Helgenberger arrives at the Los Angeles premiere of "Mr. Brooks" at Grauman's Chinese Theater on May 22, 2007, in Los Angeles. She has a role in the movie about a man who is sometimes controlled by an evil alter ego.

Marg Helgenberger's Decade on "CSI"

Marg Helgenberger of the television show "CSI" attends the 2006 Summer Television Critics Association Press Tour for the CBS Network at the Ritz Carlton Hotel on July 16, 2006 in Pasadena, Calif.

Marg Helgenberger's Decade on "CSI"

Marg Helgenberger poses for photographers after the "What a Pair! 4" concert at the Wiltern/LG Theater in Los Angeles, June 11, 2006. Proceeds of the fourth-annual benefit concert, which featured pairs of female celebrities performing Broadway songs, go to breast cancer research.

Helgenberger's mother, Kay Snyder, is a 30-year breast cancer survivor. In 2010, Helgenberger will co-host the Revlon Walk for a Cure, benefiting breast cancer research.

Marg Helgenberger's Decade on "CSI"

William Petersen and Marg Helgenberger on the set of "CSI."

Marg Helgenberger's Decade on "CSI"

Marg Helgenberger with then-husband Alan Rosenberg and her son Huey at the world premiere of "In Good Company" at Mann's Chinese Theatre on Dec. 6, 2004, in Hollywood, Calif. Helgenberger plays Dennis Quaid's wife in the film.

Marg Helgenberger's Decade on "CSI"