
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 Ryan's 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 (2000–13) and the subsequent TV movie Immortality (2015). She reprised the role in the sequel CSI: Vegas (2022–present). Helgenberger is also known for playing the role of K.C. Koloski in the ABC drama China Beach (1988–91), 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 CC-BY-SA, full list of contributors on Wikipedia.

CSI: Crime Scene Investigation
TV • 2000

Frasier
TV • 1993

Golden Globe Awards
TV • 1944

Golden Globe Awards
TV • 1944

Golden Globe Awards
TV • 1944

ER
TV • 1994

The View
TV • 1997

King of the Hill
TV • 1997

RuPaul's Drag Race
TV • 2009

Late Night with Conan O'Brien
TV • 1993

LIVE with Kelly and Mark
TV • 1988

Matlock
TV • 1986

The Ellen DeGeneres Show
TV • 2003

Intimate Portrait
TV • 1993

All Rise
TV • 2019

Tales from the Crypt
TV • 1989

Stars in the House
TV • 2020

People's Choice Awards
TV • 1975