Brendan Banfield; Juliana Peres Magalhães; Christine Banfield. Credit : Court TV via AP, Pool; AP Photo/Tom Brenner, Pool; Facebook
Credit : Court TV via AP, Pool; AP Photo/Tom Brenner, Pool; Facebook
The case that Northern Virginia came to know as The Au Pair Affair has ended with a guilty verdict and a life sentence on the horizon. Brendan Banfield, a former IRS agent, has been convicted of aggravated murder for killing his wife and a stranger in what prosecutors described as a staged BDSM scenario involving the family nanny. The killings of Christine Banfield and Joseph Ryan, once framed as a chaotic home invasion, are now officially recorded as a calculated double murder.
Jurors heard about a suburban marriage that looked stable from the outside, a live-in caregiver who became far more than help with childcare, and a husband who, prosecutors said, turned a secret life into a lethal plot. The story that unfolded in court was darker and more elaborate than the early headlines suggested, tying together bondage fantasies, a supposed intruder, and a 4‑year‑old child asleep in the house while her mother was being killed upstairs.
The killings behind “The Au Pair Affair”
To understand how this verdict landed, it helps to go back to the morning when police first walked into the Banfield home. The deaths of Christine Banfield and Joseph Ryan, later cataloged as the Murders of Christine, were initially shrouded in confusion. Brendan Banfield told officers that an unknown man had broken into the Herndon, Virginia, house and attacked his wife, a story that fit the bloody scene but not, investigators would later argue, the evidence trail. The case quickly picked up the tabloid-ready nickname The Au Pair Affair because of the central role of the family’s nanny and the BDSM framing that prosecutors said was used to lure Ryan into the home.
Investigators eventually concluded that Christine Banfield and Joseph Ryan were killed in what amounted to a staged bondage encounter, with the nanny positioned as both participant and witness. Reporting on the Christine Banfield and case describes how the killings were tied to a BDSM Plot Involving Their Nanny, a phrase that has since followed the case into every courtroom recap. By the time detectives finished reconstructing the timeline, the narrative of a random intruder had been replaced by a far more intimate horror, one that unfolded while the couple’s young daughter slept downstairs.
The prosecution’s story of a staged BDSM plot
From the start of the trial, prosecutors leaned into the idea that this was not a crime of passion but a blueprint put into action. They told jurors that Prosecutors say Brendan Banfield and the au pair, Juliana Peres Magalhães, lured Joseph Ryan to the house to frame him for Christine’s death and to make his own killing look like the desperate act of a cornered intruder. In that telling, the BDSM setup was not a kink gone wrong but a prop, designed to explain away bindings, injuries, and the presence of a stranger in a family bedroom.
The state backed up that theory with digital breadcrumbs and testimony about Banfield’s online life. In court, he was pressed about visiting a bondage-focused website, with Banfield asked whether it was a fetish site and replying, “I would not call it a fetish site.” When When he was pushed to describe it, jurors got a window into the private interests that prosecutors said he weaponized. The state also highlighted how the supposed intruder showed no signs of forcing his way in, a point echoed in Christine focused coverage that stressed the lack of forced entry at the home.
On the day of the killings, the nanny’s behavior added another strange layer. According to On the case summary, Magalhães called 911 at least three times, hanging up twice before staying on the line, behavior that prosecutors said fit a staged emergency more than a panicked one. Later, Eight months after the killings, Peres Magalhaes was arrested on suspicion of second-degree murder, and in 2024 she pleaded guilty to manslaughter, a deal that turned her into a key witness against Banfield. Her cooperation, detailed in Juliana Magalh coverage, came with the understanding that she will be required to hear victim impact statements at her own sentencing.
The verdict, the sentence, and what comes next
By the time jurors filed back into the Fairfax County courtroom, the case had already become a true-crime fixture. A jury delivered a guilty verdict against Brendan Banfield, the Northern Virginia man charged with killing his wife, Christine Ban, and a stranger in a plot with his family’s au pair. Coverage NBC Washington Staff captured the moment as the panel confirmed what a Virginia jury on Monday had already decided: Brendan Banfield of aggravated murder, guilty on all counts tied to the deaths of his wife and Joseph Ryan. Video segments from Virginia newscasts showed the case framed as the story of a husband and father accused of killing his wife and then trying to pin it on someone else.
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