YAKIMA — A 36-year-old Parker man has been charged in federal court with killing three people in Parker last month.

The Yakima Herald reports a federal grand jury indicted Clifton Frank Peter on two first-degree murder counts and a charge of second-degree murder, as well as two counts of discharging a firearm during a violent crime, according to a news release from the U.S. Attorney’s Office.

He is expected to make an initial appearance Thursday before U.S. Magistrate Judge Mary Dimke in Yakima. It wasn’t immediately clear if he had a lawyer. None was listed on the federal court docket.

Yakima County sheriff’s deputies went to Columbia Street in Parker around 6:20 p.m. June 1 for a report that someone had been shot. Responding officers found Omar Venegas-Mora, 31, his wife, 32-year-old Imelda Santillan-Guevara, and Javier Luna-Gonzalez, 63, dead at the scene, according to a sheriff’s office news release.

An autopsy determined the three had been shot to death. The Yakima County’s Sheriff’s Office said the suspect’s mother, 63, was also assaulted, but was able to escape.

Peter was arrested and was booked into the Yakima County jail Wednesday on a U.S. Marshal’s hold, according to jail records.

Federal authorities are handling the case because Peter is a citizen of the Yakama Nation and the killings occurred on the Yakama reservation.

The three are among 21 people killed in homicides in Yakima County this year.