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).
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CSI: Vegas
Catherine Willows · (31 episodes)
2021
Stars in the House
Self · (1 episode)
2020
All Rise
Lisa Benner · (45 episodes)
2019
This Changes Everything
Self
2019
A Dog's Journey
Hannah Montgomery
2019
Almost Friends
Samantha
2017
CSI: Immortality
Catherine Willows
2015
Intelligence
Lillian Strand · (13 episodes)
2014
Under the Dome
Christine Price · (11 episodes)
2013
Wonder Woman
Hera (voice)
2009
RuPaul's Drag Race
Self - Guest Judge · (1 episode)
2009
RuPaul's Drag Race
Self - Judge (archive footage) · (1 episode)
2009
Columbus Day
Alice
2008
Mr. Brooks
Emma Brooks
2007
In Good Company
Ann
2004
The Tony Danza Show
Self · (2 episodes)
2004
The Ellen DeGeneres Show
Self · (1 episode)
2003
CSI: Crime Scene Investigation
Catherine Willows · (264 episodes)
2000
Erin Brockovich
Donna Jensen
2000
Perfect Murder, Perfect Town: JonBenét and the City of Boulder
Patsy Ramsey
2000
Perfect Murder, Perfect Town: JonBenét and the City of Boulder
Patsy Ramsey · (2 episodes)
2000
The Early Show
Self · (2 episodes)
1999
Lethal Vows
Ellen Farris
1999
Happy Face Murders
Jen Powell
1999
Giving Up the Ghost
Anna Hobson
1998
Thanks of a Grateful Nation
Jerrilynn Folz
1998
Species II
Dr. Laura Baker
1998
Gold Coast
Karen DiCilia
1997
Fire Down Below
Sarah Kellogg
1997
The View
Self · (4 episodes)
1997
The Last Time I Committed Suicide
Lizzy
1997
Murder Live!
Pia Postman
1997
King of the Hill
Mrs. Hanover / Pretty Student (voice) · (1 episode)
1997
My Fellow Americans
Joanna (uncredited)
1996
Conundrum
Det. Rose Ekberg
1996
Inflammable
Lt. (j.g.) Kay Dolan
1995
Species
Dr. Laura Baker
1995
Bad Boys
Alison Sinclair
1995
Just Looking
Darlene Carpenter
1995
ER
Karen Hines · (4 episodes)
1994
Where Are My Children?
Vanessa Meyer Vernon Scott
1994
Lie Down with Lions
Kate Nessen
1994
The Cowboy Way
Margarette
1994
Blind Vengeance
1994
Keys
Maureen 'Kick' Kickasola
1994
Intimate Portrait
Self · (1 episode)
1993
Partners
Georgeanne Bidwell
1993
Frasier
Emily · (1 episode)
1993
Late Night with Conan O'Brien
Self - Guest · (1 episode)
1993
Fallen Angels
Eve Cressy · (1 episode)
1993
When Love Kills: The Seduction of John Hearn
Debbie Banister
1993
Distant Cousins
Connie
1993
The Tommyknockers
Bobbi Anderson · (2 episodes)
1993
Through the Eyes of a Killer
Laurie Fisher
1992
In Sickness and in Health
Mickey
1992
Crooked Hearts
Jennetta
1991
Death Dreams
Crista Westfield
1991
Blind Vengeance
Virginia Whitelaw
1990
Always
Rachel
1989
After Midnight
Alex (segment "All Night Operator")
1989
Tales from the Crypt
Vicki · (1 episode)
1989
LIVE with Kelly and Mark
Self - Guest · (3 episodes)
1988
China Beach: Pilot
K.C. Kolowski
1988
China Beach
KC Koloski · (64 episodes)
1988
thirtysomething
(1 episode)
1987
Shell Game
(6 episodes)
1987
Matlock
Victoria Rollins / Laura Norwood · (1 episode)
1986
Spenser: For Hire
Nancy Kettering · (1 episode)
1985
This Week
(1 episode)
1981
The Price Is Right
Self · (1 episode)
1972
Tony Awards
Self - Presenter · (2 episodes)
1956
Golden Globe Awards
Self - Audience Member · (2 episodes)
1944
Golden Globe Awards
Self - Nominee · (3 episodes)
1944
Golden Globe Awards
Self - Presenter · (1 episode)
1944