Evans allegedly told officers he was going to ram their vehicles and revved his engine. Officers set up spike strips, but Evans drove away and over someone's lawn to avoid the strips, police said.
Officers pursued him for a short time but called off the chase after Evans allegedly feigned ramming an officer and ran a red light. Police determined the chase was too dangerous to continue.
But officers kept looking for Evans' vehicle, and found it again about 9:30 a.m. near 1800 West and 600 South. They saw him leave an outbuilding wearing a tactical vest, the release said.
Police ordered him to stop and show his hands, but he ignored their commands, ran to his truck, opened the door and pulled out the rifle, police said.
"The suspect then immediately pointed the rifle at officers who engaged him," the release said. Evans died at the scene.
"It all went down pretty quick," said Provo police Lt. Brandon Post. There was about 100 feet between the officers and Evans, Post said.
Police said two officers were involved in the shooting, one from the Provo Police Department and one from the Utah County Sheriff's Office. They fired three rounds at Evans, but it was not immediately clear whether Evans fired at them, Post said. Neither officer had a body camera.
A photo of Evans' Airsoft rifle, posted on Facebook by Provo police, does not show an obvious orange tip on the rifle, which distinguishes the realistic-looking weapon from real firearms.
The countywide officer-involved shooting team is in charge of the investigation, which is ongoing.
The Provo shooting marks the fourth fatal police-involved shooting in Utah this year.