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Home — Netflix

The Staircase Ending Explained: Who Killed Kathleen?

by Mohsin Nakade
June 14, 2022 - Updated on May 19, 2025
in Netflix
The Staircase

The Staircase

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The season finale of HBO Max’s ‘The Staircase’ has finally aired. Kathleen Peterson’s unsolved death became a topic of public interest. Despite the fact that it has faded, there is still a strong desire to know the truth. However, the show makes no claim to bringing it out. Rather, it promises a fictionalized version of a certain truth – which isn’t always correct or truthful. And it is in this context that you must see the final episode to know the ending for The Staircase.

The finale of ‘The Staircase’ reveals Michael Peterson’s retrial hearing, which follows Evelyn Ivins’ discovery that SBI researcher Duane Deaver’s analysis is unreliable. Simultaneously, David Rudolf attempts to persuade Michael to accept an Alford plea. Judge Orlando Hudson grants Michael a second trial. Michael makes a pivotal decision on the Alford plea that will have effects on his future. The episode concludes with disclosures that have an impact on Michael’s connection with Sophie Brunet, as well as a key revelation concerning the former’s past with Kathleen.

The Staircase Ending Explained

Michael’s bisexuality is questioned throughout Kathleen’s investigation and retrial. The trial speculates that Michael killed Kathleen when she confronted him about his true sexual orientation and affairs after learning about them the night of her death, based on his affairs with other men, the pornography recovered from his home computer, and the remarks of Wolgamott and Dennis Rowe. Michael’s counter-argument is that Kathleen was aware of his sexuality and accepted it long before her death. Michael says that Kathleen had no reason to question him about the same.

The Staircase Ending Explained
The Staircase Ending Explained

According to Michael, Kathleen had already accepted Michael’s sexuality and occasional same-sex affairs. Therefore there was no conflict between them. Sophie, Michael’s lawyer Rudolf, and Michael’s family are satisfied by the statement that Michael had no cause to murder Kathleen. In the interview Jean conducts at the beginning of the episode, Michael discloses that Kathleen was unaware of his sexuality or encounters with other men. He acknowledges that he’s been lying about it the entire time.

Is Michael Telling The Whole Truth?

Michael’s revelation that he never told Kathleen about his homosexuality or same-sex affairs raises doubts about whether she knew about them the night she died, as the trial claims. In a flashback sequence, Kathleen questioned Michael about his bisexuality, questioning why he didn’t tell her about something like that. Michael stated that after she came into his life, he began to drift away from his bisexual identity. Michael maintains he didn’t lie, but he also believes he didn’t reveal “everything.” In the flashback sequence, Kathleen can be seen crying and asking the same question, hinting that they may have fought over it.

The Staircase Ending Explained
The Staircase Ending Explained – Michael and Kathleen

If Kathleen had discovered Michael’s bisexuality through his home computer and they had a serious dispute, he might have kept it hidden from the authorities, lawyers, and his family. Kathleen may have gotten into a fight with her husband and rushed upstairs, only to tumble down the stairs and die, according to Michael’s version of her death. Even if he didn’t kill her, the fight is a strong motive. Therefore he may have opted not to mention it so that no one would suspect him.

Michael may have discovered that keeping the prospective struggle a secret may give him a fighting chance to appeal and enlist the aid of his family. Otherwise, he might have murdered Kathleen in the heat of the moment as a result of the disagreement, as the prosecution says. It’s impossible to establish for sure if he killed Kathleen because there isn’t enough clear proof or witnesses.

Michael and Sophie’s Fight

After accepting an Alford plea, Michael walks out of the courtroom a free man. Sophie encourages Michael to prepare for their upcoming vacation to Paris, which they had planned ahead of time. Sophie fantasizes about a life where they’d be with one other in a nation far away from Kathleen’s tragic story. Michael, on the other hand, does not want to go to Paris. He informs Sophie that she will have to travel alone and that he will be there in a week. Michael wants to spend time with his children and grandchildren now that he has more free time. He is excited to spend time with them and believes that they need his care.

The Staircase Ending Explained
The Staircase Ending Explained – Michael

Michael also refuses to remove his wedding ring, insisting that Kathleen remains a part of his life. These facts irritate Sophie, who has given so much to wage a struggle for him. She believes Michael is avoiding and neglecting her, accusing him of “leaving her out” of his life. They start arguing, and Sophie discovers that Michael lied to Kathleen about Kathleen being aware of and accepting of his bisexuality and same-gender affairs. Instead of being her boyfriend, Michael becomes a liar in her eyes.

Also Read: Compliance Ending Explained: Girl Assaulted By A Prank Caller

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Mohsin Nakade

Mohsin Nakade

Yo, I'm Mohsin from Mumbai. Here I like to write about Movies, TV Shows, and mostly Superhero stuff. I love movies (Spiderman), Series (GOT), Anime (AOT), and Music (Zayn & One Direction). If you are the same then we can be Besto Friendo and you can reach out to me at mohsin.nakade1@gmail.com.

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