TMDBFrom the public credits

Marg Helgenberger

Actor

Tells you when a new project gets a date

1958Born, Fremont

61Credits

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…

Known for

Bad BoysAlison Sinclair

Under the DomeChristine Price

Erin BrockovichDonna Jensen

Mr. BrooksEmma Brooks

SpeciesDr. Laura Baker

Filmography

All Movies Shows

2025Boston BlueGwen · 1 episodeShow

2021CSI: VegasCatherine Willows · 31 episodesShow

2019All RiseLisa Benner · 45 episodesShow

2019A Dog's JourneyHannah MontgomeryMovie

2017Almost FriendsSamanthaMovie

2015CSI: ImmortalityCatherine WillowsMovie

2014IntelligenceLillian Strand · 13 episodesShow

2013Under the DomeChristine Price · 11 episodesShow

2009Wonder WomanHera (voice)Movie

2008Columbus DayAliceMovie

2007Mr. BrooksEmma BrooksMovie

2004In Good CompanyAnnMovie

2000CSI: Crime Scene InvestigationCatherine Willows · 264 episodesShow

2000Erin BrockovichDonna JensenMovie

2000Perfect Murder, Perfect Town: JonBenét and the City of BoulderPatsy RamseyMovie

2000Perfect Murder, Perfect TownPatsy Ramsey · 2 episodesShow

1999Lethal VowsEllen FarrisMovie

1999Happy Face MurdersJen PowellMovie

1998Giving Up the GhostAnna HobsonMovie

1998Thanks of a Grateful NationJerrilynn FolzMovie

1998Species IIDr. Laura BakerMovie

1997Gold CoastKaren DiCiliaMovie

1997Fire Down BelowSarah KelloggMovie

1997The Last Time I Committed SuicideLizzyMovie

1997Murder Live!Pia PostmanMovie

1997King of the HillMrs. Hanover / Pretty Student (voice) · 1 episodeShow

1996My Fellow AmericansJoanna (uncredited)Movie

1996ConundrumDet. Rose EkbergMovie

1995InflammableLt. (j.g.) Kay DolanMovie

1995SpeciesDr. Laura BakerMovie

1995Bad BoysAlison SinclairMovie

1995Just LookingDarlene CarpenterMovie

1994ERKaren Hines · 4 episodesShow

1994Where Are My Children?Vanessa Meyer Vernon ScottMovie

1994Lie Down with LionsKate NessenMovie

1994The Cowboy WayMargaretteMovie

1994KeysMaureen 'Kick' KickasolaMovie

1993PartnersGeorgeanne BidwellMovie

1993FrasierEmily · 1 episodeShow

1993Fallen AngelsEve Cressy · 1 episodeShow

1993When Love Kills: The Seduction of John HearnDebbie BanisterMovie

1993Distant CousinsConnieMovie

1993The TommyknockersBobbi Anderson · 2 episodesShow

1992Through the Eyes of a KillerLaurie FisherMovie

1992The Larry Sanders ShowSusan Elliot · 1 episodeShow

1992In Sickness and in HealthMickeyMovie

1991Crooked HeartsJennettaMovie

1991The Hidden RoomJane · 1 episodeShow

1991Death DreamsCrista WestfieldMovie

1990Blind VengeanceVirginia WhitelawMovie

1989AlwaysRachelMovie

1989After MidnightAlex (segment "All Night Operator")Movie

1989PeacemakerMrs. CooperMovie

1989Tales from the CryptVicki · 1 episodeShow

1988China Beach: PilotK.C. KolowskiMovie

1988China BeachKC Koloski · 64 episodesShow

1987thirtysomething1 episodeShow

1987Shell Game6 episodesShow

1986MatlockVictoria Rollins / Laura Norwood · 1 episodeShow

1985Spenser: For HireNancy Kettering · 1 episodeShow

1982American PlayhouseMrs. Cooper (segment 'Peacemaker') · 1 episodeShow

Is this you?

Link these credits to your frames profile.

Link your credits