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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| # | Name | Character | Rating | |
|---|---|---|---|---|
| 1 | A Dog's Journey (2019) | Hannah Montgomery | 7.1 | |
| 2 | This Changes Everything (2019) | Self | - | - |
| 3 | Almost Friends (2017) | Samantha | 6 | |
| 4 | CSI: Immortality (2015) | Catherine Willows | 6.5 | |
| 5 | Wonder Woman (2009) | Hera (voice) | 7.5 | |
| 6 | Columbus Day (2008) | Alice | - | - |
| 7 | Mr. Brooks (2007) | Emma Brooks | 7.2 | |
| 8 | In Good Company (2004) | Ann | 6.2 | |
| 9 | Erin Brockovich (2000) Oscars 2001 | Donna Jensen | 6.9 | |
| 10 | Perfect Murder, Perfect Town: JonBenét and the City of Boulder (2000) | Patsy Ramsey | - | - |
| 11 | Happy Face Murders (1999) | Jen Powell | - | - |
| 12 | Lethal Vows (1999) | Ellen Farris | 5 | |
| 13 | Species II (1998) | Dr. Laura Baker | 5.6 | |
| 14 | The Last Time I Committed Suicide (1997) | Lizzy | 9 | |
| 15 | Fire Down Below (1997) | Sarah Kellogg | 1 | |
| 16 | Murder Live! (1997) | Pia Postman | - | - |
| 17 | My Fellow Americans (1996) | Joanna (uncredited) | 6.3 | |
| 18 | Bad Boys (1995) | Alison Sinclair | 7 | |
| 19 | Species (1995) | Dr. Laura Baker | 5.7 | |
| 20 | The Cowboy Way (1994) | Margarette | 7 | |
| 21 | Keys (1994) | Maureen 'Kick' Kickasola | - | - |
| 22 | When Love Kills: The Seduction of John Hearn (1993) | Debbie Banister | - | - |
| 23 | Through the Eyes of a Killer (1992) | Laurie Fisher | - | - |
| 24 | Death Dreams (1991) | Crista Westfield | - | - |
| 25 | Crooked Hearts (1991) | Jennetta | - | - |
| 26 | Always (1989) | Rachel | 5.8 |
