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Detectives Take Stand in Banfield Double‑Murder Trial After Au Pair’s Two‑Day Account

Prosecutors now seek to corroborate the cooperating au pair’s story through police testimony.

Overview

  • Brendan Banfield, a former IRS agent, is on trial in Fairfax County for aggravated murder in the 2023 deaths of his wife, Christine, and Joseph Ryan, and he has pleaded not guilty with a potential life sentence.
  • Juliana Peres Magalhães, the Brazilian au pair who pleaded guilty to manslaughter, testified that Banfield posed as his wife on a fetish site to lure Ryan and then staged the scene to look like a home invasion.
  • Defense attorney John Carroll challenged her credibility with jailhouse letters, memory gaps and motive, and she acknowledged receiving jail funds from a media company and negotiating to sell her story.
  • A Fairfax detective testified Thursday that months after the killings he found the au pair’s lingerie in the master closet and photos of Banfield with her replacing pictures of his wife.
  • Prosecutors are calling detectives and other witnesses as the multiweek trial proceeds, and Banfield also faces child‑abuse charges tied to his then‑4‑year‑old daughter being in the home.