 Federal agencies have joined local authorities in the search for a motive and any shooters. Fox's Gernot Scott, several others were injured. Actress Shannon Doherty has died after battling cancer a second time. She was 53. 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 television.