Idaho ? A gunman suspected of killing three people and himself said during a court-ordered mental evaluation that if he committed suicide, he would try to take a large number of people with him, police said Monday.

Three months after that conversation, authorities say, Jason Hamilton shot and killed his wife at their home, then drove downtown with two assault rifles and fired a barrage of bullets into an emergency dispatch center inside a courthouse and a parking lot outside.

A police officer rushing to the scene late Saturday was killed, and two officers and a civilian who tried to help were wounded. Investigators said Hamilton, 36, also killed sexton Paul Bauer, 62, in an office of the nearby First Presbyterian Church early Sunday as 911 dispatchers on the phone with Bauer heard the shots.

Officers who stormed the church hours later found a rifle and ammunition next to Hamilton’s body in the sanctuary.

Hamilton had a history of violence, and a judge ordered him evaluated after he tried to kill himself in February by overdosing on anti-anxiety medication. Hamilton told a hospital worker that if he really wanted to commit suicide, he would do it through a mass shooting or bombing, Assistant Police Chief David Duke said.

Hamilton was judged not to need involuntary commitment and was released, Duke said.