Mary Marg Helgenberger (born November 16, 1958) is an American actress. She is best known for her roles as Catherine Willows in the CBS drama CSI: Crime Scene Investigation (2000–2013), and as K.C. Koloski in the ABC drama China Beach (1988–1991), which earned her the 1990 Emmy Award for Outstanding Supporting Actress in a Drama Series. She has also appeared in the series Ryan's Hope (1982–1986) and the films Species (1995), Species II (1998),...
Read full biography of Marg Helgenberger →
Mary Marg Helgenberger (born November 16, 1958) is an American actress. She is best known for her roles as Catherine Willows in the CBS drama CSI: Crime Scene Investigation (2000–2013), and as K.C. Koloski in the ABC drama China Beach (1988–1991), which earned her the 1990 Emmy Award for Outstanding Supporting Actress in a Drama Series. She has also appeared in the series Ryan's Hope (1982–1986) and the films Species (1995), Species II (1998),...