A Virginia man was arrested Monday and charged with four counts of murder in the death of his wife and another man in a baffling case involving the couples au pair , with whom he was having an affair, in February 2023.

Brendan Banfield, a 39-year-old criminal special agent, was indicted by a grand jury on four counts of aggravated murder and a firearm charge, Fairfax County Commonwealths attorney announced at a news conference on Monday alongside the Fairfax County Police chief.

His arrest came 19 months after the killings of his wife, Christine Banfield, a 37-year-old pediatric nurse, and Joseph Ryan, 39, in their house in Herndon, an affluent suburb of Washington, D.C. On Feb. 24, 2023, just after 8 a.m., police responding to a 911 call found Christine Banfield nude in her upstairs bedroom with fatal stab wounds. Ryans body was just feet away. He was fully clothed and had been shot to death, allegedly by different guns, authorities said.