The bullets hit Matthew Walter Wong, 22, in the back and right arm and he died at the scene, an autopsy found.

An Oregon State Police (OSP) trooper shot and killed a person ... something about laying down arms" to a guard stationed outside of the airfield, according to a dispatch report.

A Marion County grand jury on Friday unanimously found an Oregon State ... police responded to a report around 10 a.m. on Feb. 27 that Matthew Walter Wong had given a threatening note to a guard ...