Sophie Turner is the latest high-profile star to join HBO Max’s Michael Peterson limited drama series The Staircase.Game of Thrones alum Turner will play Margaret Ratliff, one of Michael Peterson’s adopted daughters, in the scripted telling of the infamous murder case.She will feature alongside Colin Firth, Toni Collette, Juliette Binoche, Rosemarie DeWitt and Parker Posey in the eight-part drama.The series, which comes from Christine director Antonio Campos and American Crime Story writer Maggie Cohn, explores the life of Michael Peterson (Firth), his sprawling North Carolina family and the suspicious death of his wife, Kathleen (Collette).DeWitt plays Candace Zamperini, Kathleen Peterson’s sister and Posey plays Freda Black, assistant
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