Mary Marg Helgenberger (born November 16, 1958) is an American film and television actress 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. Marg (pronounced with a hard 'G') Helgenberger was born in Fremont, Nebraska and raised in North Bend, Nebraska. Marg graduated from North Bend Central High School. She is the daughter of Mary Kay (ne Bolte), a nurse, and Hugh Helgenberger, a meat inspector. Helgenberger is of Irish and German descent and had a Roman Catholic upbringing. Marg has one older sister named Ann and a younger brother named Curt. Helgenberger played the French horn in her high school marching band. Until she went to college, Helgenberger aspired to be a nurse, as had her mother.
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