A Washington County patrol deputy was sentenced Thursday to five years of probation after admitting to attacking his girlfriend while off-duty last year. He quit his job on the same day.

Brian Waterbury, 35, pleaded guilty to fourth-degree assault and menacing in Washington County Circuit Court. He admitted to harming his girlfriend in April 2017 and threatening her that September, court records show.

Additional charges of strangulation, attempted strangulation, coercion and harassment were dropped as part of a plea agreement. The terms of his probation include having no contact with the victim without permission from his probation officer, surrendering all weapons, including guns, and completing a domestic violence intervention program, court records show.

The Washington County Sheriff's Office said a complaint against Waterbury was filed in April and he was put on paid leave two days later as a criminal investigation was conducted. Waterbury was arrested in September in connection with three incidents involving the woman at a home where they lived together, Beaverton police said. The sheriff's office said he had been on unpaid leave since at least October and resigned from the agency on Thursday.

Waterbury had been with the sheriff's office for nearly 10 years.

According to court documents, Waterbury was arrested in October while out on bail due to an arrest warrant in the case. He posted bail the same day and was arrested again on Jan. 25 because he had repeated contact with the woman, violating his release agreement, the documents said.

The woman told police on Jan. 24 that she'd seen Waterbury 10 times in person since his September arrest and he'd been using a prepaid cellphone to contact her, records show.

-- Everton Bailey Jr.

ebailey@oregonian.com

503-221-8343; @EvertonBailey