The conviction of Brendan Banfield brings a dramatic end to one of Northern Virginia’s most disturbing criminal trials, closing a case that combined betrayal, deception and violence inside a quiet suburban home. A Fairfax County jury found Banfield guilty of aggravated murder in the 2023 killings of his wife and another man, accepting prosecutors’ argument that the crimes were the result of a calculated plot tied to an extramarital affair.
The unanimous verdict, delivered Monday, means Banfield now faces a mandatory sentence of life in prison without the possibility of parole. Judge Penney Azcarate scheduled sentencing for May 8.
A Plot Built Around Deception
Jurors deliberated for several days after hearing evidence that Banfield, a former IRS law enforcement officer, conspired with the family’s Brazilian au pair, Juliana Peres Magalhães, to kill his wife, Christine Banfield, inside their Herndon, Virginia home in February 2023. The prosecution said the plan also involved killing Joseph Ryan and staging the scene to make him appear responsible for Christine’s death.
According to prosecutors, Banfield and Magalhães carried out an elaborate online scheme, creating a fake profile on the fetish website FetLife while impersonating Christine. Using that account, they allegedly lured Ryan to the home with promises of rough sex. Magalhães testified that both she and Banfield posted from Christine’s laptop and only did so when Christine was present, in an effort to establish alibis.
On the morning of the killings, Magalhães left the house with the Banfields’ 4-year-old child and waited in her car while Ryan arrived. Banfield, prosecutors said, had already left and was waiting at a nearby McDonald’s for confirmation. Once Ryan was inside the home, the attack unfolded.
Prosecutors said Ryan was shot twice — once in the head by Banfield and once in the chest by Magalhães. Christine Banfield was stabbed and left to bleed to death. Prosecutors further alleged that Banfield smeared Christine’s blood onto Ryan’s body to make it appear he had attacked her, before calling police.
Banfield was also convicted of using a firearm in the commission of a felony and child endangerment, because the child was present in the home during the killings.
Fairfax County Commonwealth’s Attorney Steve Descano described the crimes as exceptionally disturbing, saying Banfield stood out among homicide defendants he has encountered in six years in office.
Testimony, Plea Deal and a Rejected Defense
Magalhães’ testimony was central to the prosecution’s case. Initially charged with murder in October 2023 — eight months after the killings and nearly a year before Banfield was charged — she later agreed to cooperate with authorities. In exchange, her charges were reduced to manslaughter. She now faces a possible sentence ranging from time served to a maximum of 10 years in prison.
Descano said prosecutors waited to charge Banfield until blood analysis was complete and maintained they were prepared to proceed to trial without Magalhães’ cooperation. He argued that her testimony provided crucial clarity for jurors and justified the plea agreement.
Defense attorney John Carroll attacked Magalhães’ credibility, suggesting she told prosecutors what they wanted to hear to save herself. He emphasized that Banfield’s DNA was not found on the knife used to kill Christine and argued that prosecutors failed to prove the so-called “catfishing” plot. The defense also highlighted Magalhães’ pretrial discussions with a media company about selling her story for a documentary, suggesting ulterior motives.
Banfield himself took the stand in his own defense, a move prosecutor Jenna Sands said surprised her. Banfield told jurors he rushed home after receiving a call from the au pair, heard noises in the bedroom, and saw Ryan holding a knife to Christine. He testified that he identified himself as police and shot Ryan only after seeing him stab his wife, insisting he was trying to de-escalate the situation.
During cross-examination, Sands challenged Banfield’s account and demeanor, arguing he appeared cold and emotionally detached. She said he never spoke of himself as Christine’s husband and did not express affection or grief in a way jurors would expect.
After the verdict was read, Banfield again showed little outward emotion. Descano said he hopes Banfield now understands he did not outsmart the system and will be forced to live with what he did to his wife and Joseph Ryan for the rest of his life.
With sentencing ahead and Magalhães still awaiting her own punishment, the case leaves behind a stark reminder of how a private relationship, prosecutors said, escalated into a meticulously planned double homicide inside a family home.
