ELKHORN, Wis. (AP) -

An investigation has cleared a Walworth County sheriff's deputy who shot and wounded a bank robbery suspect after a chase last month.

Waukesha County District Attorney Brad Schimel found that Deputy Dan Nichols shot in self-defense when he fired at the suspect's vehicle.

Nichols had kneeled to put down stop sticks to try to puncture the suspect's fires when the suspect allegedly drove at him. The deputy fired at the vehicle, wounding the suspect.

The district attorney concluded Nichols' use of force "was the only reasonable decision he could make under those circumstances."

Authorities say the suspect drove off after the bank robbery in Town of Sugar Creek, reaching speeds of more than 80 mph through Walworth and Waukesha counties.

Nichols returned to full duty from administrative duty on Tuesday.