Michael did technically take a guilty plea, which Kathleen's sister Candace took as admission that he did indeed commit murder. ... "I can't tell you if [Michael is] innocent or not," he said in a recent interview with The Wrap. "I didn't know at the time of the start [of filming] and I don't know, 16 years later."

Who killed Kathleen The Staircase?

In 2003, Michael Peterson was convicted of murdering his wife, Kathleen Peterson. The trial was the subject of the popular Netflix documentary series, The Staircase. In 2011, Michael Peterson was granted the right to a new trial.

Is The Staircase real footage?

'The Staircase' Is a True Story, But Don't "Spoil" Yourself. You should know a bare minimum of facts going in. It should be impossible to “spoil” a documentary, especially one that's about a widely publicized murder trial from over a decade ago.