 We lost actress Shannon Doherty over the weekend, best known for her roles on TV's original Beverly Hills 90210 and on Charmed. She had been battling cancer, breast cancer, for years. Shannon Doherty got her start in Hollywood as a child actress. But it was in 1990 that Doherty became a household name, playing Brenda Walsh in Beverly Hills 90210. I don't know, everyone says he's trouble. And in 1998, playing Prue Hollowell in Charmed. Power of three was