
Marg Helgenberger
Biography
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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Acting (41 movies)

Erin Brockovich
2000

Species II
1998

In Good Company
2004

Mr. Brooks
2007

Bad Boys
1995

Species
1995

My Fellow Americans
1996

The Last Time I Committed Suicide
1997

Columbus Day
2008

Fire Down Below
1997

Wonder Woman
2009

After Midnight
1989

The Cowboy Way
1994

Thanks of a Grateful Nation
1998

Happy Face Murders
1999

Crooked Hearts
1991

Through the Eyes of a Killer
1992

Death Dreams
1991

Lethal Vows
1999

Lie Down with Lions
1994

Perfect Murder, Perfect Town: JonBenét and the City of Boulder
2000

Distant Cousins
1993

Conundrum
1996

Gold Coast
1997

Blind Vengeance
1990

Inflammable
1995

Where Are My Children?
1994

CSI: Immortality
2015

China Beach: Pilot
1988

Giving Up the Ghost
1998

Almost Friends
2017

Just Looking
1995

In Sickness and in Health
1992

Keys
1994

When Love Kills: The Seduction of John Hearn
1993

Always
1989

Murder Live!
1997

This Changes Everything
2019

A Dog's Journey
2019

Blind Vengeance
1994

Peacemaker
1989
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