 Doherty starred as Brenda Walsh in the hit teenage melodrama Beverly Hills 90210. Oh, whatever gets you through the night, right? I mean, isn't that what you always say? Her battle against breast cancer was made public in 2015. Doherty underwent a single mastectomy, chemotherapy, and radiation, but her cancer returned in 2020 at stage four. When she died on Saturday, her publicist says she was surrounded by loved ones and her dog. Shannon Doherty was 53.