
Marg Helgenberger
Explore the best Marg Helgenberger movies ranked by Movie Rankings users. Browse biography, ranked filmography, and movie detail links for Marg Helgenberger.
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.
What is the best Marg Helgenberger movie?
Movie Rankings is still collecting enough aggregate data to name a definitive top Marg Helgenberger movie.
How many Marg Helgenberger movies are ranked here?
This page tracks every ranked credit we currently have for Marg Helgenberger, and expands as more titles and comparisons are added.
How often do Marg Helgenberger rankings update?
These rankings refresh whenever Movie Rankings recomputes global results. This page was last generated from site data on May 14, 2026.
Sources & freshness
Last refreshed from site data on May 14, 2026.






































































