Helgenberger appeared as a guest star in the season fourteen episode "Frame by Frame", before returning for the feature length finale "Immortality".
Catherine Willows was raised by her single mother, Lily Flynn, a cocktail waitress and showgirl.
During her peak, the 63-years-old dated some of the most handsome mans of the Hollywood.
She is best known for her roles as Catherine Willows in the CBS police procedural drama CSI: Crime Scene Investigation (2000–12, 2013) and the subsequent TV movie Immortality (2015) and as K. 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. She has one older sister named Ann and a younger brother named Curt.
Soon after completing college, Helgenberger landed her first professional role on the long-running ABC Daytime soap opera in March 1982, playing amateur cop Siobhan Ryan Novak Du Bujak, a role previously played by Ann Gillespie.
After nearly four years, Helgenberger left the show in January 1986 to pursue new opportunities.