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Shannen Doherty — who played a Beverly Hills High student, a Heather, and a Charmed one — died this week. She was diagnosed with breast cancer in 2015, which metastasized to her brain in 2023. Friends and co-stars poured out their grief for one of the women who defined the ’90s. Holly Marie Combs, Doherty’s co-star on Charmed and ally in the show’s long afterlife, said there was a hole in her heart. “My most ardent champion. My loyal protector. My best friend,” she wrote on Instagram. “You taught me the meaning of family. You were and will be forevermore my sister. I love you.” Sarah Michelle Gellar, one of Doherty’s closest friends, wrote “I keep reminding myself it only hurts this…