Mary Marg Helgenberger (born November 16, 1958) is an American actress. She is best known for her roles as Catherine Willows in the CBS drama CSI: Crime Scene Investigation (2000–2012, 2013) and the subsequent TV movie Immortality (2015) and as K.C. Koloski in the ABC drama China Beach (1988–1991), which earned her the 1990 Emmy Award for Outstanding Supporting Actress in a Drama Series.
She has also starred in the TV series Under the Dome, Intelligence, and Ryan's Hope, and the films Species (1995), Species II (1998), Erin Brockovich (2000), and Mr. Brooks (2007).

Biography

In 1984, Helgenberger met Alan Rosenberg, a guest actor on Ryan's Hope. The two became friends and started dating in 1986. They married in 1989 and have one son, Hugh Howard Rosenberg (b. 1990), named after Helgenberger's late father. On December 1, 2008, the couple announced that they were separating, and on March 25, 2009, she filed for divorce. Their divorce was finalized in February 2010.

As a result of Helgenberger's mother's 27-year battle against breast cancer, Helgenberger and Rosenberg became involved in the fight against breast cancer and have hosted a benefit called Marg and Alan's Celebrity Weekend annually in Omaha since 1999.

Best films