Oscar-nominated Toni Collette is set to star opposite Colin Firth in The Staircase, HBO Max’s drama limited series adaptation based on the true crime docuseries.Collette will play Kathleen Peterson, a corporate executive, mother and stepmother of five, and wife of Michael Peterson, played by Firth.The eight-episode series, from Antonio Campos, the director of Rebecca Hall-fronted feature Christine, and American Crime Story writer Maggie Cohn, explores of life of Michael Peterson, his sprawling North Carolina family, and the suspicious death of his wife, Kathleen.The series is based on the docuseries and various books and reports on the case.
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