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Sean O'Connell was Camille's twin brother and Father Kieran's nephew. He was studying to become a priest like his uncle when a witch who was angry at Kieran's interference with the French Quarter Coven's Harvest ritual hexed him with the Rosary of Madness. Shortly afterward, the hex drove Sean insane and caused him to kill all nine of his fellow seminary students before finally killing himself.
Sean is a member of the O'Connell Family.