The Clark County Prosecuting Attorney’s Office found that the county sheriff’s deputies who shot and killed a Portland woman armed with a hammer and knife in March were justified in using deadly force.

Deputy Tom Yoder used a Taser to try to stop 38-year-old Amy Jean McCoy from advancing toward him and Deputy Joe McLoughlin, but when that failed to stop her, they feared for their lives and shot her several times, according to a letter dated Thursday that outlines the decision.

The letter, written by Chief Deputy Prosecutor Scott Jackson to Clark County Sheriff Chuck Atkins, gives the following account of events:

The incident began when a witness reported at about 4:20 p.m. on March 13 that he saw a Mini Cooper driven by McCoy traveling at a high rate of speed north in the southbound lanes of Northeast Covington Road in the Five Corners area.

The Mini Cooper nearly struck two oncoming vehicles, continued traveling at a high rate of speed and eventually crashed into a tree or pole near 7500 N.E. Covington Road.