 took to Instagram to pay tribute to her close friend, Shannon Doherty, who passed away on Saturday. We know that Shannon Doherty was known for her roles in Beverly Hills 90210 and Charmed. She was diagnosed with stage four breast cancer in 2015. Geller said, how do you possibly find the right words to sum up 30 years of friendship? So having somebody come out and say that they were a close friend or considered Shannon Doherty to be a close friend, I think is something that you need to have happen at this time.