 actress shannon doherty has died after a long battle with breast cancer fox's michelle pollino looks back on her career shannon doherty became an instant celebrity when she burst onto the scene as brenda walsh on aaron spelling's huge hit beverly hills 90210 the memphis tennessee-born actress began her career in television at the age of 11 in small roles then in 1988 she hit the big screen in the dark comedy heathers she left her role as brenda on