TLDR: Sophie Brunet is a French film editor who worked on The Staircase documentary series about Michael Peterson starting in 2003. She developed a romantic relationship with Peterson through letters and prison visits that lasted 13 years, from his conviction in 2003 until shortly after his release in 2017.
The relationship raised significant questions about editorial bias in the documentary, since she was shaping how audiences perceived Peterson’s story while simultaneously falling in love with him.
The 2022 HBO dramatic series depicted her character, played by Juliette Binoche, in ways she and the original director publicly rejected as inaccurate and unfair.
When The Staircase documentary series became a global phenomenon, most viewers focused on Michael Peterson: Was he guilty? Was the documentary telling the truth? What did the owl theory actually mean?
Far fewer people asked about the French film editor sitting in a Paris studio, working through hundreds of hours of raw footage, making the decisions that would shape what millions of viewers believed about a man convicted of murdering his wife.
Her name was Sophie Brunet. And while she was building Peterson’s documentary story, she was also falling in love with him.
Who Sophie Brunet Is
Sophie Brunet is one of France’s most accomplished film and television editors, with a career that extends well beyond her involvement in the Peterson case.
Her credits include Blue Is the Warmest Color, the Palme d’Or winner at Cannes, and the popular Netflix series Call My Agent!, known internationally as Dix pour cent.
She has worked extensively with director Jean-Xavier de Lestrade, who hired her to edit The Staircase.
In French cinema, the editor is often described as a “second director,” the person who finds the thematic heartbeat of the material after the camera has stopped rolling.
Brunet had been editing films for roughly a decade when de Lestrade brought her onto the Peterson project in 2002, following his own Academy Award win for the documentary Murder on a Sunday Morning.
She was based in Paris and never traveled to Durham during the trial. The hundreds of hours of raw footage came to her. She shaped it into a narrative in a studio thousands of miles from the courtroom where Peterson’s fate was being decided.
How the Relationship Started
Peterson was convicted of first-degree murder in October 2003 and sentenced to life in prison. Brunet, who had reviewed the footage closely enough to believe a miscarriage of justice had occurred, was reportedly shocked by the verdict.
She has been clear that she did not fall in love with Peterson while editing the footage. The relationship developed through correspondence after the conviction.
She began writing to him in prison and sending him books. Peterson described her as his “only real friend in prison,” the person to whom he could reveal his fears and vulnerability.
The letter-writing became visits. Brunet traveled to Durham 17 times between 2004 and 2008 alone.
The relationship was private within the inner circle of the production for several years. It became public knowledge around 2011 and 2012, when Brunet appeared on camera in later documentary updates seated with Peterson’s children during a hearing.
Her role had visibly shifted from removed observer to central figure in his personal life.
The Ethics Problem
The revelation created an immediate and serious ethical problem for the documentary. The person who had shaped the public’s perception of Michael Peterson, who had made the editing decisions that determined what millions of viewers saw and believed, was romantically involved with him.
Critics identified several patterns in the documentary they argued reflected a pro-Peterson bias. The financial motive, including Peterson’s $143,000 in debt and the life insurance policies that paid out after Kathleen’s death, was minimized. Peterson’s lies about his military record received limited attention.
The evidence suggesting Kathleen had bled out over a period of hours was underemphasized. The 1985 death of Elizabeth Ratliff in Germany, which the prosecution used to establish a pattern, was framed sympathetically toward Peterson rather than as a potential precursor killing.
Brunet’s response to the bias allegations was direct. “I have too big an opinion of my job to be even remotely tempted to do anything like that.” She also pointed out that she was not the only editor on the project and that de Lestrade, who remained genuinely undecided about Peterson’s guilt for much of the production, would not have approved a biased cut.
De Lestrade’s stated purpose was never to determine guilt or innocence, but to examine how the American justice system handled a wealthy defendant with a sophisticated legal team.
From that framing, the documentary’s focus on prosecutorial overreach and flawed forensics was consistent with its stated mission rather than evidence of romantic bias.
Whether you find that defense convincing likely depends on whether you think Peterson killed Kathleen. The two questions became difficult to separate.
What Peterson Said About Her
Peterson has never been reluctant to discuss Brunet. In his 2019 memoir Behind the Staircase, he describes their connection at length and confirms they made extensive plans for a future together in Paris, plans that kept him grounded during his years at Granville Correctional Institution.
He also offered an honest reflection on what the relationship actually was. In his memoir he acknowledged that the plans for Paris were, in significant part, a “joint fantasy.” The fantasy allowed him to escape the reality of a life sentence and gave him a reason to keep fighting his legal battles.
He also wrote that “prison and age had shriveled my heart,” suggesting that the version of himself that Brunet loved was difficult to sustain once the circumstances changed.
How the HBO Series Depicted Her and Why She Rejected It
The 2022 HBO dramatic series The Staircase, created by Antonio Campos and starring Colin Firth as Peterson and Toni Collette as Kathleen, cast Juliette Binoche as Sophie Brunet. The casting of one of France’s most celebrated actresses in the role underscored how central the editor’s story had become to the public’s understanding of the case.
Brunet and de Lestrade both went public with their sense of betrayal after the series aired. De Lestrade had granted Campos full access to his archives and had allowed him to accompany the crew during later filming, believing the series would be a respectful exploration of the documentary and the case.
The HBO portrayal suggested the relationship had begun while Brunet was editing the original trial footage, a timeline she disputes. It also depicted her fighting to remove damning footage from the documentary, which she rejected as false.
The depiction, Brunet said, made her look “unscrupulous and scheming.” She felt the series used her as a scapegoat to undermine the documentary’s credibility while borrowing its footage and access.
Brunet did meet with Juliette Binoche, and the two became friends. She described that friendship as the “only happy ending” from her experience with the HBO production.
Why the Relationship Ended
Peterson entered his Alford plea in February 2017 and was released having already served more than the time required by his reduced sentence. The relationship ended in May 2017, shortly after his freedom.
For years the plan had been for Peterson to move to Paris and live in Brunet’s apartment. When the moment arrived, he didn’t go. He cited his age, the language barrier, financial concerns, and his desire to stay near his children and grandchildren in America.
He wrote that he simply didn’t have the “energy or interest” to pursue that passion anymore and that he couldn’t give Brunet “what she really needed and deserved.”
The fantasy that had sustained both of them for 13 years could not survive contact with the actual logistics of freedom.
He stayed in Durham. She remained in Paris.
The relationship that had lasted through a murder trial, a life sentence, years of appeals, and a wrongful conviction finding ended when there was finally nothing left to keep them apart.
Where They Are Now
Michael Peterson remained in Durham after his release. He lived for a period as a companion with his first wife, Patricia “Patty” Peterson, until her death from a heart attack in 2021.
He continues to write and maintains a low public profile while remaining a subject of intense interest for true crime audiences.
As of 2026 he is 82 years old.
Sophie Brunet continues her career as a film and television editor in France. Her professional partnership with Jean-Xavier de Lestrade remains intact. She has described the Peterson chapter as a significant and painful part of her personal history but has moved forward from it.
Her professional achievements, which predate and postdate the documentary, speak for themselves.
The documentary she helped edit is still on Netflix. The questions it raised about the American justice system are still unresolved. The question of whether her feelings for Peterson shaped what viewers saw is one that the available evidence cannot definitively answer, which is perhaps the most honest conclusion available.
For the full story of the evidence the documentary left out, including the financial motive, the deleted computer files, and the $25 million judgment Peterson can never escape, that’s covered in detail here.
