EXCLUSIVE: Rosemarie DeWitt is set to star alongside Toni Collette and Colin Firth in The Staircase, HBO Max’s drama limited series adaptation based on the true-crime docuseries.The eight-episode series from Antonio Campos, who directed the Rebecca Hall-fronted feature Christine, and American Crime Story writer Maggie Cohn, explores the life of Michael Peterson, played by Firth, his sprawling North Carolina family and the suspicious death of his wife, Kathleen (Collette).DeWitt will play Candace Zamperini, Kathleen Peterson’s (Collette) sister.The series is based on the docuseries and various books and reports on the case.
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