‘The Staircase’ is HBO Max’s new true-crime series about the shocking death of Kathleen Peterson. See the cast side-by-side with the real people.
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‘The Staircase’ Cast: Michael Peterson & More
![‘The Staircase’ Cast: Michael Peterson & More](https://hollywoodlife.com/wp-content/uploads/2022/05/Michael-Peterson-Colin-Firth-the-staircase-copy.jpg?w=680)
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Toni Collette As Kathleen Peterson
![Toni Collette As Kathleen Peterson](https://hollywoodlife.com/wp-content/uploads/2022/05/Toni-Collette-Kathleen-Peterson-the-staircase.jpg?w=680)
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Patrick Schwarzenegger As Todd Peterson
![Patrick Schwarzenegger As Todd Peterson](https://hollywoodlife.com/wp-content/uploads/2022/05/Todd-Peterson-Patrick-Schwarzenegger-the-staircase.jpg?w=680)
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Sophie Turner & Odessa Young As Margaret & Martha Ratliff
![Sophie Turner & Odessa Young As Margaret & Martha Ratliff](https://hollywoodlife.com/wp-content/uploads/2022/05/Sophie-Turner-Odessa-Young-Margaret-Martha-Ratliff-the-staircase.jpg?w=680)
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Olivia DeJonge As Caitlin Atwater
![Olivia DeJonge As Caitlin Atwater](https://hollywoodlife.com/wp-content/uploads/2022/05/Olivia-DeJonge-Caitlin-Atwater-the-staircase.jpg?w=680)
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Parker Posey As Freda Black
![Parker Posey As Freda Black](https://hollywoodlife.com/wp-content/uploads/2022/05/Parker-Posey-Freda-Black-the-staircase.jpg?w=680)
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Michael Stuhlbarg As David Rudolf
![Michael Stuhlbarg As David Rudolf](https://hollywoodlife.com/wp-content/uploads/2022/05/Michael-Stuhlbarg-David-Rudolf-the-staircase.jpg?w=680)