According to a spokesman with the Illinois Department of Natural Resources, the trooper was conducting a traffic stop in the vicinity of I-88 and mile marker 35, and an INDR Conservation Officer (CPO) responded to a call for assistance. After the CPO arrived, the driver of the stopped car aggressively pinned the state trooper between his car and another car while the trooper was on foot, officials said.
The CPO on the scene in fear of his life and the life of the trooper, so he discharged his weapon and fatally shot the driver of the car, the spokesman said.
The CPO will be placed on temporary paid administrative leave as a standard procedure for his own well-being.
No other details were available.
The incident is under investigation by Illinois State Police.