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After twelve years as investigation supervisor Catherine Willows on the TV series "CSI," Marg Helgenberger is leaving the show this month.

Marg Helgenberger has practically become an institution on American television. In addition to "CSI," she's also known for playing part-time prostitute K.C. Koloski on ABC's "China Beach," for which she won an Emmy for Outstanding Actress in a Drama Series.

The Nebraska-born actress is also getting the 2,458th star on the Hollywood Walk of Fame for 2012, recognizing her work in television.

Fun fact: She also played a minor character (named Suzanne) in the 1982 movie Tootsie.