Lisa Lyon -- a game changer in professional women's bodybuilding -- has died, TMZ has learned.
A close friend who has been helping Lisa and her family tells us, Lisa died Friday at her home in the San Fernando Valley, where she was in hospice care. We're told the cause of death was stomach cancer.
Lisa famously posed for Playboy back in 1980, and the year before she won the first International Federation of Bodybuilders Woman's World Pro Bodybuilding Championship. It was a huge achievement that really put women's bodybuilding on the map.