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Washington County sheriff's Deputy Michael Trotter was critically injured Wednesday, April 27, 2022, when another car hit his patrol car, authorities said.A bouquet of flowers rests near the entrance to Southridge High School in Beaverton on Wednesday, April 27, 2022.Washington County Sheriff Pat Garrett called for a moment of silence while displaying a photo of critically-injured deputy Michael Trotter during a press conference on Wednesday, April 27, 2022.Southridge High School in Beaverton is shown here.Washington County Sheriff Pat Garrett called for a moment of silence during a press conference on Wednesday, April 27, 2022.Southwest Tualatin Valley Highway just east of Murray Boulevard is shown here after a crash killed two Beaverton students, wounded three other students and critically injured a Washington County Sheriff's deputy just after midnight on Wednesday, April 27, 2022.

An 18-year-old from Tigard pleaded not guilty Friday in Washington County Circuit Court after police said he drove through a red light and slammed his car into a Washington County deputy’s patrol vehicle, killing two high school students and critically injuring two others in his car and the deputy.