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Marg Helgenberger

Acting · Born November 16, 1958 · Fremont, Nebraska, USA

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).

Movies with Marg Helgenberger

• Bad Boys (1995) — Alison Sinclair
• Erin Brockovich (2000) — Donna Jensen
• A Dog's Journey (2019) — Hannah Montgomery
• Species (1995) — Dr. Laura Baker
• Mr. Brooks (2007) — Emma Brooks
• Species II (1998) — Dr. Laura Baker
• In Good Company (2004) — Ann
• Fire Down Below (1997) — Sarah Kellogg
• Wonder Woman (2009) — Hera (voice)
• Always (1989) — Rachel
• The Cowboy Way (1994) — Margarette
• The Last Time I Committed Suicide (1997) — Lizzy

TV shows with Marg Helgenberger

• CSI: Crime Scene Investigation (2000) — Catherine Willows
• All Rise (2019) — Lisa Benner
• Under the Dome (2013) — Christine Price
• CSI: Vegas (2021) — Catherine Willows
• China Beach (1988) — KC Koloski
• Intelligence (2014) — Lillian Strand