Brendan Banfield double homicide trial: Man discovered responsible in elaborate plot to eliminate his spouse

A Virginia man has been found guilty of killing his wife and a stranger lured to their home under false pretenses in an elaborate plot to get rid of his spouse so he could be with his au pair, with whom he was having an affair. 

Brendan Banfield, 40, is accused of stabbing his wife to death in their home in Fairfax County and fatally shooting a man he allegedly “catfished” on a fetish website. Prosecutors said he pretended to be his wife to lure the man to their home for what was believed to be a consensual fake rape scenario in order to frame that stranger for his wife’s murder.

The jury deliberated nearly nine hours over two days, starting Friday, before reaching a verdict Monday afternoon, finding him guilty of two counts of aggravated murder. He exhibited little emotion while the verdict was read.

His sentencing has been scheduled for May 8. He faces a life sentence without the possibility of parole.

The former IRS agent was charged with aggravated murder in 2024 following a monthslong investigation into the deaths of his wife, 37-year-old nurse Christine Banfield, and the man, 39-year-old Joseph Ryan.

Prosecutors accused Brendan Banfield of plotting the murders with the family’s au pair, 25-year-old Juliana Peres Magalhaes, who was initially charged with second-degree murder in connection with the deaths. 

Ahead of the trial, Peres Magalhaes pleaded guilty to manslaughter. Under the plea agreement with prosecutors, she will receive time served for testifying against Brendan Banfield.

During closing arguments on Friday, the prosecutor made the case that the murders were premeditated.

“He was in love with Juliana. He can pretend that this was a fling and affair — he’d had them before, no big deal. He was in love with Juliana,” prosecutor Jenna Sands said. “He was afraid of losing her. He needed to get rid of his wife so that they could be together, so that they could marry, so that they could have those babies that he was picking out names for.”

Sands said there was no evidence that Christine Banfield had previously used dating or fetish websites, argued that there were signs that the crime scene had been “manipulated,” and reminded jurors that during the au pair’s testimony, Peres Magalhaes “told us how the plan was crafted and how it played out.”

The defense, meanwhile, pushed back on the catfishing theory, questioned the thoroughness of the investigation and argued that there were conclusions made based on confirmation bias. The attorney, John Carroll, claimed that prosecutors pressured Peres Magalhaes to change her story and that she “secured herself a deal that benefited her.” Carroll also said Brendan Banfield didn’t have to testify, but he did as they sought “to get the truth out there.”

“Is it reasonable, after a six- to eight-week affair, that someone is going to try to get rid of their companion of 19 years, wife of 12 years? Is that reasonable?” Carroll asked the jury. “You heard from my client: He thinks it’s absurd.”

During his testimony, Brendan Banfield called the allegations “absolutely crazy” and said his affair with Peres Magalhaes was just that and nothing more.

He said he came home on Feb. 24, 2023, after the au pair called to alert him about a stranger in the home. He said he went up to his bedroom with his gun drawn and found his wife naked with Ryan and that she called out, “Brendan, he has a knife!”

“I was extremely terrified,” Brendan Banfield told the jury. “I don’t think I’ve ever been more panicked in my life.”

He said he fired his government-issued firearm, striking Ryan in the head, after the man appeared to stab his wife. 

Prosecutors said Christine Banfield was stabbed seven times in the neck.

Peres Magalhaes testified that Brendan Banfield expressed his desire to “get rid of” his wife in October 2022, saying, “At first, I thought he was joking.”

She testified that she had helped Brendan Banfield catfish Ryan on the fetish website to lure Ryan to the home.

Peres Magalhaes told the court that Brendan Banfield told her he wanted to marry her and have children with her, and that he didn’t want to divorce his wife because “she would have more money than he would” and because he wanted custody of the couple’s daughter.

Brendan Banfield was additionally charged with using a firearm while committing or attempting to commit murder and child endangerment. The couple’s then-4-year-old daughter was in the house at the time of the killings, in the basement. The jury found him guilty of those two counts as well.

“He left her in the basement, knowing that Joe Ryan was upstairs,” Sands said during her closing argument. “He left her in the basement while he shot and killed Joe Ryan. He left her in the basement while he stabbed his wife.”