Los Angeles - Porn star Marilyn Chambers, who pioneered the transformation of adult movies from the furtive to the mainstream, has died at age 56 at her Los Angeles County home, police said Monday.

Chambers, whose real name was Marilyn Ann Taylor, starred in 1972's Behind The Green Door, which is often seen as the first porn film to gain widespread distributions as video cassettes were becoming popular in US homes.

Chambers was famous at the time as a model for a popular soap brand and her career switch to porn star was widely covered in the media.

A spokesman for the coroner's office said that the cause of death is under investigation but that foul play is not suspected.