FLORENCE — A man has changed his plea in the case of a collision that injured a deputy.

Bryan Whittemore, 34, pleaded guilty Wednesday to aggravated assault in connection with a three-vehicle collision that injured a Pinal County sheriff’s deputy on Nov. 17, 2018.

Whittemore, of Casa Grande, admitted to fault in the early-morning crash in a southbound lane of Pinal Avenue near Casa Grande Municipal Airport.

The injured Pinal County deputy was on a traffic stop waiting for a tow truck to remove an impounded Chevrolet Blazer, according to Casa Grande police. As the deputy stood on the passenger side of his vehicle, a Dodge dual-wheeled pickup truck, driven by Whittemore, struck his marked patrol vehicle from the rear, knocking the deputy toward the airport fence and his Tahoe into the back of the Blazer.

The driver of the impounded vehicle had already been cited and left the scene prior to the collision.

The deputy was flown to a Phoenix-area hospital for treatment of non-life-threatening injuries.

Whittemore was originally charged with aggravated assault, endangerment, aggravated criminal damage, DUI and reckless driving. The charges were reduced to aggravated assault via a plea agreement with prosecutors.

The charge is a Class III felony, punishable by 2.5 to 8.75 years in prison with a presumptive sentence of 3.5 years.

Pinal County Superior Court Judge Delia Neal set Whittemore’s sentencing for 9 a.m. Sept. 18 and remanded him to the custody of the Pinal County jail without bond.