 Doherty starred as Brenda Walsh in the hit teenage melodrama Beverly Hills 90210. Well, 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. Fox's Pam Puso, her publicist, says Doherty died yesterday, surrounded by loved ones and her dog.