The Staircase series adds Hereditary's Toni Collette to star alongside Colin Firth

Sam Warner
·2-min read
Photo credit: Jenny Anderson/WireImage - Getty Images
Photo credit: Jenny Anderson/WireImage - Getty Images

The upcoming scripted adaptation of true-crime series The Staircase has added Toni Collette to star as Kathleen Peterson.

The Hereditary actress will appear in the HBO Max limited series opposite Colin Firth as Michael Peterson, who was convicted of murdering his wife before the conviction was changed to voluntary manslaughter.

Kathleen is described as a corporate executive, mother and stepmother of five, while the series itself will explore Michael's life, his sprawling family and Kathleen's suspicious death.

Photo credit: Jenny Anderson/WireImage - Getty Images
Photo credit: Jenny Anderson/WireImage - Getty Images

Related: The Staircase raises an all-important question for true-crime fans

The original documentary series was released in 2004, with an update in 2013 before Netflix added a few more episodes in 2018.

The Staircase's new scripted drama will be executive produced by American Crime Story's Maggie Cohn alongside Christine's Antonio Campos, who will direct six of the series' eight episodes.

Photo credit: Gareth Cattermole / Staff - Getty Images
Photo credit: Gareth Cattermole / Staff - Getty Images

Related: The Staircase on Netflix: Answering 7 BIG questions raised by the true-crime doc

"This has been a project I have been working on in one way or another since 2008," Campos said. "It's been a long and winding road, but well worth the wait to be able to find partners like HBO Max, Annapurna, co-showrunner Maggie Cohn and the incredible Colin Firth to dramatise such a complex true-life story."

Alongside Hereditary, Oscar-nominee Collette recently starred in Netflix's I'm Thinking of Ending Things and Unbelievable, as well as Knives Out.

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