Mary Marg Helgenberger born November 16 1958 is an American actress She began her career in the early 1980s and first came to attention for playing the role of Siobhan Ryan on the daytime soap opera Ryans Hope from 1982 to 1986 She is best known for her role as Catherine Willows in the CBS police procedural drama CSI Crime Scene Investigation 200013 and the subsequent TV movie Immortality 2015 She reprised the role in the sequel CSI Vegas 2022present Helgenberger is also known for playing the role of KC Koloski in the ABC drama China Beach 198891 which earned her the 1990 Emmy Award for Outstanding Supporting Actress in a Drama Series She is also known for roles in the TV series Under the Dome and Intelligence and the films Species 1995 Species II 1998 Erin Brockovich 2000 and Mr Brooks 2007 Description above from the Wikipedia article Marg Helgenberger licensed under CCBYSA full list of contributors on Wikipedia
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