Marg Helgenberger — Biography

Born on November 16, 1958, Marg Helgenberger is an American performer who embarked on her acting journey in the early 1980s. Her initial recognition came from her portrayal of Siobhan Ryan in the daytime drama Ryan's Hope, a role she held from 1982 to 1986. She gained widespread fame for embodying Catherine Willows in the acclaimed CBS series CSI: Crime Scene Investigation, a part she played from 2000 to 2013, and later revisited in the 2015 television film Immortality. Helgenberger also returned to the character in the spin-off CSI: Vegas, appearing in its second season which debuted on September 29, 2022. Prior to her CSI success, she was recognized for her performance as K.C. Koloski in the ABC drama China Beach (1988–91), a role that secured her the 1990 Emmy Award for Outstanding Supporting Actress in a Drama Series. Her diverse acting portfolio also includes appearances in the television series Under the Dome and Intelligence, as well as notable film roles in Species (1995), Species II (1998), Erin Brockovich (2000), and Mr. Brooks (2007).