Brenda from Beverly Hills: 90210 was written off the show because Shannen Doherty was being a demanding self-entitled bitch and got fired.Prue Halliwell was killed in Charmed because Shannen Doherty was fired for being a demanding self-entitled bitch and kept getting into arguments and having hissy fits about Alyssa Milano. You’d think the woman would have learned her lesson at some point.