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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as Gwen(1 ep)
as Catherine Willows(31 eps)
as Self(1 ep)
as Lisa Benner(45 eps)
as Self
as Hannah Montgomery
as Samantha
as Catherine Willows
as Lillian Strand(13 eps)
as Christine Price(11 eps)
as Self(1 ep)
as Hera (voice)
as Self - Guest Judge(1 ep)
as Self(1 ep)
as Alice
as Emma Brooks
as Ann
as Self(2 eps)
as Self(1 ep)
as Catherine Willows(264 eps)
as Donna Jensen
as Patsy Ramsey(2 eps)
as Self(2 eps)
as Ellen Farris
as Jen Powell
as Anna Hobson
as Jerrilynn Folz
as Dr. Laura Baker
as Karen DiCilia
as Sarah Kellogg
as Self(4 eps)
as Pia Postman
as Mrs. Hanover / Pretty Student (voice)(1 ep)
as Joanna (uncredited)
as Det. Rose Ekberg
as Lt. (j.g.) Kay Dolan
as Dr. Laura Baker
as Alison Sinclair
as Darlene Carpenter
as Karen Hines(4 eps)
as Vanessa Meyer Vernon Scott
as Kate Nessen
as Margarette
as Maureen 'Kick' Kickasola
as Self(1 ep)
as Georgeanne Bidwell
as Emily(1 ep)
as Self - Guest(1 ep)
as Eve Cressy(1 ep)
as Debbie Banister
as Connie
as Bobbi Anderson(2 eps)
as Laurie Fisher
as Susan Elliot(1 ep)
as Mickey
as Jennetta
as Jane(1 ep)
as Crista Westfield
as Virginia Whitelaw
as Rachel
as Alex (segment "All Night Operator")
as Mrs. Cooper
as Vicki(1 ep)
as Self - Guest(3 eps)
as K.C. Kolowski
as KC Koloski(64 eps)
as Victoria Rollins / Laura Norwood(1 ep)
as Nancy Kettering(1 ep)
as Mrs. Cooper (segment 'Peacemaker')(1 ep)
as Self - Presenter(1 ep)
as Self(1 ep)
as Self - Presenter(2 eps)
as Self - Audience Member(2 eps)
as Self - Nominee(3 eps)
as Self - Presenter(1 ep)