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.

Filmography

• CSI: Vegas — Catherine Willows
• 2019A Dog's Journey — Hannah Montgomery
• All Rise — Lisa Benner
• 2017Almost Friends — Samantha
• 2015CSI: Immortality — Catherine Willows
• Intelligence — Lillian Strand
• Under the Dome — Christine Price
• 2009Wonder Woman — Hera (voice)
• 2008Columbus Day — Alice
• 2007Mr. Brooks — Emma Brooks
• 2004In Good Company — Ann
• CSI: Crime Scene Investigation — Catherine Willows
• 2000Erin Brockovich — Donna Jensen
• Perfect Murder, Perfect Town — Patsy Ramsey
• 2000Perfect Murder, Perfect Town: JonBenét and the City of Boulder — Patsy Ramsey
• 1999Happy Face Murders — Jen Powell
• 1999Lethal Vows — Ellen Farris
• 1998Giving Up the Ghost — Anna Hobson
• 1998Species II — Dr. Laura Baker
• 1998Thanks of a Grateful Nation — Jerrilynn Folz
• 1997Fire Down Below — Sarah Kellogg
• 1997Gold Coast — Karen DiCilia
• King of the Hill — Mrs. Hanover / Pretty Student (voice)
• 1997Murder Live! — Pia Postman
• 1997The Last Time I Committed Suicide — Lizzy
• 1996Conundrum — Det. Rose Ekberg
• 1996My Fellow Americans — Joanna (uncredited)
• 1995Bad Boys — Alison Sinclair
• 1995Inflammable — Lt. (j.g.) Kay Dolan
• 1995Just Looking — Darlene Carpenter
• 1995Species — Dr. Laura Baker
• ER — Karen Hines
• 1994Keys — Maureen 'Kick' Kickasola
• 1994Lie Down with Lions — Kate Nessen
• 1994The Cowboy Way — Margarette
• 1994Where Are My Children? — Vanessa Meyer Vernon Scott
• 1993Distant Cousins — Connie
• Fallen Angels — Eve Cressy
• Frasier — Emily
• 1993Partners — Georgeanne Bidwell
• The Tommyknockers — Bobbi Anderson
• 1993When Love Kills: The Seduction of John Hearn — Debbie Banister
• 1992In Sickness and in Health — Mickey
• The Larry Sanders Show — Susan Elliot
• 1992Through the Eyes of a Killer — Laurie Fisher
• 1991Crooked Hearts — Jennetta
• 1991Death Dreams — Crista Westfield
• The Hidden Room — Jane
• 1990Blind Vengeance — Virginia Whitelaw
• 1989After Midnight — Alex (segment "All Night Operator")
• 1989Always — Rachel
• 1989Peacemaker — Mrs. Cooper
• Tales from the Crypt — Vicki
• China Beach — KC Koloski
• 1988China Beach: Pilot — K.C. Kolowski
• Shell Game
• thirtysomething
• Matlock — Victoria Rollins / Laura Norwood
• Spenser: For Hire — Nancy Kettering
• American Playhouse — Mrs. Cooper (segment 'Peacemaker')
• This Week

Appearances as themselves (15)

• Stars in the House — Self
• 2019This Changes Everything — Self
• The Talk — Self
• RuPaul's Drag Race — Self - Guest Judge
• The Tony Danza Show — Self
• The Ellen DeGeneres Show — Self
• The Early Show — Self
• The View — Self
• Intimate Portrait — Self
• Late Night with Conan O'Brien — Self - Guest
• LIVE with Kelly and Mark — Self - Guest
• People's Choice Awards — Self - Presenter
• The Price Is Right — Self
• Tony Awards — Self - Presenter
• Golden Globe Awards — Self - Audience Member, Self - Nominee, Self - Presenter