Brendan Banfield

Brendan Banfield was a former federal law-enforcement officer who worked as an IRS special agent. He lived in Northern Virginia with his wife, Christine Banfield, their young daughter and the family's Brazilian au pair, Juliana Peres Magalhães.

Banfield and Magalhães eventually began a romantic relationship. Prosecutors later argued that their affair became the central motivation behind a plan to remove Christine and allow Banfield and Magalhães to continue their relationship together.

Banfield's only confirmed murders were the killings of Christine Banfield, 37, and Joseph Ryan, 39, on February 24, 2023.

According to the prosecution's case, Banfield and Magalhães used an online fetish website to lure Ryan to the Banfield family home under the pretense of a sexual encounter. Prosecutors said the purpose was to create a situation in which Ryan could be blamed for Christine's death.

Ryan arrived at the home and was subsequently shot. Christine was stabbed repeatedly in the neck. Prosecutors argued that Banfield and Magalhães then manipulated the crime scene to make it appear that Ryan had attacked Christine and that Banfield had intervened to protect his wife.

Their four-year-old daughter was also inside the home during the killings, leading to Banfield's separate child-endangerment conviction.

The prosecution described the killings as an elaborate staged murder rather than a spontaneous act of violence.

Banfield and Magalhães allegedly used a false online identity to attract Ryan to the family home. Prosecutors said Ryan was deliberately selected as a potential scapegoat who could be portrayed as a violent intruder responsible for Christine's death.

Banfield then shot Ryan and stabbed Christine, after which the crime scene was manipulated. Blood-spatter evidence became particularly important to the prosecution, with an expert testifying that the bodies had been moved after they were injured.

Police initially investigated the deaths according to the account given by Banfield and Magalhães. Banfield claimed that he had discovered Ryan attacking Christine and had shot Ryan while attempting to protect his wife.

As investigators reconstructed the events, however, inconsistencies emerged in the original account. Digital evidence, communications and forensic evidence increasingly pointed toward a planned encounter rather than a random home invasion.

Magalhães was arrested in October 2023. She eventually pleaded guilty to involuntary manslaughter in Ryan's death and agreed to testify against Banfield. Her testimony became an important part of the prosecution's case.

Banfield was indicted in 2024 on charges arising from both killings.

Banfield's trial took place in Fairfax County, Virginia, in early 2026. He testified in his own defence and maintained that he had acted in self-defence after discovering Ryan attacking Christine.

Prosecutors presented evidence that Banfield and Magalhães had been conducting a romantic affair and had developed a plan to eliminate Christine. They argued that Ryan had been deliberately lured to the house and then used as a supposed perpetrator of the murder.

On February 2, 2026, a Fairfax County jury convicted Banfield of two counts of aggravated murder, use of a firearm in the commission of a felony, and child endangerment.

On June 5, 2026, Banfield was sentenced to life imprisonment without the possibility of parole. The aggravated-murder convictions carried mandatory life sentences under Virginia law.

In July 2026, Banfield filed notice that he intends to appeal his convictions and sentence.

The case became known as the "Au Pair Murder" or "Au Pair Affair" case because of Banfield's relationship with Magalhães and the unusual circumstances surrounding the killings.

Prosecutors argued that Banfield did not simply want to end his marriage. According to their theory, he wanted to remove Christine while avoiding the consequences of divorcing her and potentially losing custody of their daughter. Magalhães testified that Banfield was concerned about the consequences of divorce and instead developed a plan to "get rid of" Christine.

Joseph Ryan appears to have been selected because Banfield and Magalhães could lure him to the house through an online sexual encounter and then portray him as a dangerous stranger who had attacked Christine. Prosecutors argued that this would provide Banfield with a justification for killing Ryan while simultaneously concealing his involvement in Christine's murder.

The prosecution's case was substantially strengthened by forensic blood-spatter evidence. Investigators argued that the physical evidence contradicted Banfield's account of discovering an ongoing attack and indicated that the bodies had been manipulated after the injuries occurred.

Magalhães pleaded guilty to involuntary manslaughter and was sentenced to 10 years in prison in February 2026 after testifying against Banfield.

Banfield continues to maintain that he was wrongly convicted. His attorney filed notice of appeal in July 2026.

Sources:

• Fairfax County Police Department
• Fairfax County Commonwealth's Attorney's Office
• Fairfax County Circuit Court
• Virginia Court of Appeals
• IRS Criminal Investigation
• Associated Press
• ABC News
• CBS News
• NBC Washington
• The Washington Post
• Court TV
• WTOP