FILE - In this April 27, 2000, file photo adult film legend Marilyn Chambers, left, poses with Tracy Hutson, the actress who portrays her in the Showtime film "Rated X," at a screening of the film at the Academy of Motion Picture Arts & Sciences in Beverly Hills, Calif. Chambers was found dead by her 17-year-old daughter at her home in northern Los Angeles County on Sunday, April 12, 2009, according to her friend Peggy McGinn. She was 56. The cause of death has not been determined. (AP Photo/Chris Pizzello, file)
LOS ANGELES " A friend of adult film star Marilyn Chambers says the actress has been found dead at her home in northern Los Angeles County.
Peggy McGinn says the 56-year-old Chambers was found by her 17-year-old daughter Sunday night and the cause of death has not been determined.
Chambers starred in the 1972 film "Behind the Green Door," which was more widely distributed and attracted a more mainstream audience than the usual adult fare.
Chambers, whose given name was Marilyn Briggs, was once a model for Ivory Snow. She was among the first porn superstars when the stag films of the 1940s through 1960s gave way to the more polished sex films of the 1970s.