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A carjacker killed in a shootout with an Illinois State Police trooper Saturday afternoon was a wanted parole violator from Missouri, authorities said Sunday.

The Illinois State Police identified the man Sunday as Billy L. Walker Jr., 53, of Hillsboro. He was pronounced dead at 4:45 p.m., by the Macoupin County Coroner after the shooting near Staunton. 

The shootout followed a police chase that began about an hour earlier with reports of an armed carjacking  in Glen Carbon, the Illinois State Police said. The trooper who shot and killed Walker was injured in the shootout, but was said to be recovering and was expected to return to duty.

The carjacking was reported near the Sam's Club at Illini Drive and Troy Road in Glen Carbon about 3:45 p.m. The carjacker fired shots during the robbery, authorities said, but it wasn't clear if anyone was injured there.

A state trooper spotted the vehicle heading north on Interstate 55 and chased it until it ran off the road near Staunton, about 30 miles to the north.

Walker got out and ran, and the state trooper chased after him on foot, according to the Illinois State Police.

Walker fired a gun at the trooper, who returned fire, striking and killing Walker, the state police said.

The 36-year-old trooper has been with the agency for 11 years.

Walker had an outstanding felony warrant for probation violation resulting from weapons offenses, according to Illinois State Police. Walker was considered armed and dangerous.

Denise Hollinshed is a reporter for the St. Louis Post-Dispatch