Husband, Au Pair Charged in Double Murder Plot at Northern Virginia Home

A Fairfax County jury convicted Brendan Banfield, 40, a former IRS special agent, of two counts of aggravated murder for the February 24, 2023 killings of his wife, Christine Banfield, 37, and a stranger, Joseph Ryan, 39, who was lured to the couple's Herndon, Virginia home through a months-long digital impersonation scheme. Jurors also found him guilty on a firearms charge and child endangerment. Sentencing is scheduled for May 8, with Banfield facing life in prison without the possibility of parole.

Prosecutors laid out a scheme that exploited Christine Banfield's identity at every level: her name, her photograph, and her domestic address. According to Fairfax County Deputy Commonwealth's Attorney Jenna Sands, Banfield downloaded Christine's photo from Facebook, created a fake profile in her name on FetLife, a BDSM-oriented social platform, and spent months chatting with potential targets via Telegram. Ryan was told he was arranging a consensual encounter at the Banfield home. He arrived expecting to meet Christine. Instead, prosecutors said, Banfield shot Ryan, stabbed Christine seven times in the neck, then manipulated Ryan's body to smear Christine's blood across his right hand, constructing a scene designed to make Ryan appear to be her killer.

Juliana Peres Magalhães, the Brazilian au pair the Banfields had hired in 2022 to care for their then-4-year-old daughter, pleaded guilty to manslaughter in 2024 after cooperating with investigators and testified at trial that she witnessed Banfield stab Christine. She and Banfield had been in a sexual relationship since 2022, exchanging messages about baby names and a shared future. On February 13, 2026, a judge sentenced Magalhães to the maximum 10 years in prison, rejecting prosecutors' recommendation of time served and deportation.

The case took more than 18 months to crack. At the crime scene, Banfield and Magalhães told responding officers that Ryan was a stranger who had broken in and attacked Christine, and that both had fired shots to stop him. That account held until investigators began scrutinizing the couple's digital footprints. A key turning point came when the Banfields' young daughter was heard calling Magalhães "Mommy" just days after Christine's death, a detail that focused scrutiny on the au pair and ultimately produced the cooperation agreement that unraveled Banfield's constructed narrative. He was not charged with murder until September 2024.

His background as a trained IRS law enforcement officer raised pointed questions throughout the trial about whether professional knowledge shaped how he staged the scene and managed investigators' initial impressions. Defense attorney John Carroll argued that police rushed to a theory and reverse-engineered evidence to support it, noting that even the lead homicide detective and the forensic detective disagreed over the catfishing premise. The jury rejected that argument after deliberating approximately nine hours over two days.

At sentencing in May, the child endangerment conviction tied to the couple's daughter, who was in the basement of the Herndon home when her parents were killed, will factor alongside the two aggravated murder counts that now define the case against her father.