Former IRS Agent Convicted in Elaborate Plot to Kill Wife
A Fairfax County jury found Brendan Banfield guilty on Monday of murdering his wife and a stranger in an elaborate conspiracy orchestrated with the family’s au pair. The former IRS law enforcement officer faces an automatic life sentence without the possibility of parole.
Banfield, 40, was convicted on two counts of aggravated murder, as well as charges for using a firearm during a felony and child endangerment. The jury deliberated for nearly nine hours over two days before delivering the verdict.
The Crime: A Deadly Catfishing Scheme
Prosecutors alleged that Banfield and Juliana Peres Magalhaes, the 25-year-old Brazilian au pair employed by the family, created a fake account on a fetish website impersonating Christine Banfield, his 37-year-old wife and nurse. They used the scheme to lure Joseph Ryan, a 39-year-old man, to their Herndon, Virginia home on February 24, 2023, under the pretense of a consensual role-play scenario.
Once Ryan entered the home, Banfield shot him in the head. According to testimony, Peres Magalhaes also fired a shot into Ryan’s chest. Banfield then stabbed his wife Christine seven times in the neck. Blood evidence showed Banfield deliberately transferred Ryan’s blood onto his wife’s body to frame the stranger for her murder.
The Au Pair’s Pivotal Role
Juliana Peres Magalhaes pleaded guilty to manslaughter and agreed to testify against Banfield in exchange for receiving time served. Her testimony proved crucial to the prosecution’s case. She detailed how the murder plot was crafted and executed, providing prosecutors with the framework they needed to prove premeditation.
During closing arguments, prosecutor Jenna Sands argued that Banfield’s obsession with Peres Magalhaes motivated the murders. “He was in love with Juliana,” Sands told jurors. “He was afraid of losing her. He needed to get rid of his wife so that they could be together.”
Blood Evidence as the Smoking Gun
Fairfax County Commonwealth’s Attorney Steve Descano emphasized that blood evidence was the linchpin of the case. “The case was about the blood,” Descano stated after the verdict. “This case was always going to be about the blood.”
The prosecution presented evidence that the crime scene had been manipulated, with blood smeared and wiped on Ryan’s body to fabricate a scenario in which he had attacked Christine Banfield.
The Defense Argument
Banfield’s defense attorney John Carroll challenged the catfishing theory, arguing that prosecutors failed to produce corroborating evidence. Carroll contended that Peres Magalhaes fabricated the story to secure a favorable plea deal and that Banfield’s DNA was not found on the knife used to kill Christine.
“Juliana made it up,” Carroll argued. “She told the commonwealth what they wanted to hear.” Carroll also raised questions about Peres Magalhaes’ credibility, noting she had discussed selling her story to a media company for a documentary.
A Child Witnessed the Crime
The jury also convicted Banfield on a charge of child endangerment stemming from the couple’s then-4-year-old daughter being in the home during the murders. The child was in the basement while the violent crimes unfolded upstairs.
What Comes Next
Banfield’s sentencing is scheduled for May 8, 2026. Under Virginia law, his conviction on aggravated murder charges carries an automatic life sentence without parole eligibility.
Juliana Peres Magalhaes is scheduled to be sentenced on February 13, 2026. She faces up to 10 years in prison as part of her plea agreement.
