Mary Marg Helgenberger (born November 16, 1958 in Fremont, Nebraska) is an American film and television actress, perhaps best known for her roles as Catherine Willows in the CBS drama CSI: Crime Scene Investigation, and as K.C. Koloski in the ABC drama China Beach (which earned her the 1990 Emmy Award for Outstanding Supporting Actress in a Drama Series).
In 1984, Marg Helgenberger met Alan Rosenberg, a guest actor on Ryan's Hope. The two became friends and started dating in 1986. They married in 1989 and have one son, Hugh Howard Rosenberg (born October 21, 1990), named after Helgenberger's late father, Hugh Helgenberger. On December 1, 2008, the couple announced that they were separating, and on March 25, 2009, she filed for divorce.
As a result of Helgenberger's mother's 27 year battle against breast cancer, Helgenberger and Rosenberg became involved in the fight against breast cancer. They have hosted a benefit called Marg and Alan's Celebrity Weekend every year in Omaha, Nebraska since 1997.
Helgenberger continues to be included in lists of Hollywood's Most Beautiful. In 2002 she was listed on People Magazine’s "50 Most Beautiful People", she was included in Esquire Magazine’s “5 More Women We Love” in 2002, she ranks #16 on VH1's 40 Hottest Women over 40, number 15 of The 25 Most Attractive (Famous) Women in America in 2004, in 2004 she ranked number 35, 30, 29, 20, 17, 12 and 9 on The Glamour Girls Hot 100 due to her movie In Good Company and her TV Guide cover. She was on the list for about 10 weeks and spent 1 week on the top ten. She is the 4th oldest woman to be in the top ten. Her character on CSI: Crime Scene Investigation, Catherine Willows, along with the character of Gil Grissom, was named number 82 in "Bravo's 100 Greatest TV Characters". On March 2006, Catherine Willows was named number 6 on The Star's Top Ten Hottests TV Characters. In 2007, Marg was named one of the most pleasant celebrities on E! online's Answer B!tch Q&A page. On March 2007 Helgenberger was named one of the sexiest TV stars of 2007 by TV Guide Magazine. Entertainment Weekly included her in the list of "The EW 100 Stars We Love Right Now" in 2007. On April 2008, she joined the roster of celebrities that sported the famous milk mustache as she was chosen as an endorser of the Got Milk? campaign.
HQ, GQ Photo shots: