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“The Au Pair, the Affair and Murder”: 20/20 Reports on Christine Banfield & Joseph Ryan Homicides February 20 2026

Ryan Gill

ABC’s 20/20 shines a national spotlight on one of Fairfax County’s most shocking double homicide cases in the two-hour special The Au Pair, the Affair and Murder, airing February 20, 2026. The episode delves into the calculated killing of 37-year-old pediatric nurse Christine Banfield, found stabbed inside her suburban Virginia home, and the simultaneous shooting of Joseph Ryan, a stranger lured to the house under false pretenses.

The broadcast unpacks the complex layers of betrayal, manipulation, and premeditation involving Christine’s husband, Brendan Banfield, and their 23-year-old Brazilian au pair, Juliana Peres Magalhães. What first appeared to be a violent break-in turned out to be a staged crime scene orchestrated as part of a deadly plot to clear the path for an illicit affair.

A Quiet Suburb, a Gruesome Scene

The case began on February 24, 2023, with a frantic 911 call from inside the Banfield home in Herndon, Virginia. On the line was Juliana Peres Magalhães, claiming she returned to the house unexpectedly and walked in on a knife attack. In the same call, Brendan Banfield could be heard saying he had shot the attacker. Police arrived to find Joseph Ryan, 39, dead from a gunshot wound and Christine Banfield suffering from multiple stab wounds. She was rushed to the hospital but did not survive.

At first, authorities gave weight to the possibility of a home invasion. But inconsistencies in both Brendan’s and Juliana’s accounts raised suspicion. There were no signs of forced entry, and physical evidence failed to support the chaotic struggle they described. What followed was a monthslong investigation into a murder that quickly unraveled into a tale of deception and control.

Uncovering the Secret Relationship

Investigators soon discovered that Brendan Banfield, a former IRS law enforcement agent, had been having an affair with Magalhães. The relationship began in 2022 and included secret trips and intimate plans for a future together. Prosecutors revealed that Banfield expressed a desire to avoid divorce, citing financial motives and concerns about custody of the couple’s young daughter.

This motive laid the groundwork for a chilling scheme. Using a fetish website called FetLife, Banfield posed as his wife to lure Joseph Ryan into their home for a staged BDSM scenario. According to testimony from Magalhães, Brendan wanted to make it appear that Christine was engaging in a rape fantasy gone wrong — one that ended with Ryan being killed in self-defense.

The Murder Plot and the Fatal Encounter

On the day of the killings, Magalhães called 911 three times, hanging up twice before reporting the emergency. When police arrived, they found the couple’s daughter in the basement, unharmed. Upstairs, they encountered the bodies of Christine and Ryan. Christine had been stabbed seven times in the neck; Ryan had been shot in the head.

Brendan Banfield claimed he arrived to find Ryan attacking Christine and shot him to save her. But forensic evidence and digital trails told a different story. Investigators traced online profiles used to lure Ryan back to devices controlled by Banfield and Magalhães. Blood evidence contradicted Brendan’s account, with patterns indicating Christine was attacked from above, not during a struggle.

Trial, Testimony, and Conviction

In October 2024, Magalhães was arrested and initially charged with second-degree murder. She later struck a deal with prosecutors, pleading guilty to involuntary manslaughter in exchange for testifying against Banfield. Her detailed courtroom testimony proved pivotal. She described the plan, the execution, and the brutal moment when Brendan fatally stabbed Christine in the bedroom.

Banfield’s defense argued that the prosecution relied too heavily on a cooperating witness with incentive to lie. His legal team questioned the credibility of Magalhães and alleged law enforcement bias. Banfield also took the stand in his own defense, describing the scenario as a misunderstanding and calling the accusations “crazy.”

The jury deliberated for two days before finding Brendan Banfield guilty on all charges, including two counts of aggravated murder, child endangerment, and firearm use during a felony. His sentencing is scheduled for May 8, 2026, where he faces life in prison without parole.

Aftermath, Sentencing, and the Families’ Grief

Juliana Peres Magalhães is scheduled to be sentenced shortly after the 20/20 episode airs. Prosecutors have recommended time served — just over two years — due to her cooperation, but she still faces a possible 10-year sentence. Regardless of the outcome, she will be deported to Brazil following her release.

Christine Banfield’s family, who attended the entire trial, spoke publicly for the first time after the verdict. In a heartfelt statement, they described Christine as devoted, compassionate, and betrayed in both life and death. They expressed gratitude to the jury and investigators and extended sympathy to Joseph Ryan’s family, acknowledging that he, too, was an innocent victim.

Ryan, who had no prior connection to the Banfields, believed he was engaging in a consensual encounter. Instead, he was manipulated into playing a role in a murder plot. His family has maintained his innocence throughout and received an apology from Christine’s relatives.

A House of Secrets and a National Scandal

The Banfield case has captivated national attention not only for the violence but for the web of lies that unraveled inside a seemingly idyllic suburban home. At its heart is the exploitation of trust — between spouses, caregivers, and the innocent individuals caught in the crossfire.

As 20/20 details, the murders of Christine Banfield and Joseph Ryan were not crimes of passion, but calculated acts by individuals seeking to rewrite their futures at the expense of others’ lives. The consequences were deadly. The justice system has now rendered its verdict, but the scars left behind endure — in two grieving families and a community shaken by betrayal.

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