The other trooper was shot in the abdomen and is listed in serious condition at an undisclosed hospital.
Authorities say two Pennsylvania state troopers were shot and the suspect was killed outside a grocery store south of Pittsburgh.
One trooper was life-flighted immediately to a Morgantown, WV hospital - and one trooper was rushed via an ambulance to a hospital.
The incident happened at around 9 p.m. outside of the Shop 'n Save on West Church Street.
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Witnesses said the troopers, possibly working undercover, saw a man they believed had an outstanding warrant against him. When they started to physically control him, Belsar pulled a.38-bore pistol from his belt and discharged one shot, striking the two troopers. The suspect was shot dead on the scene.
State police along with the Fayette County District Attorney's Office are investigating.
State police would release no further information Friday but a news conference is scheduled for Saturday at the state police barracks in Uniontown. "Providing a safe environment for our employees and guests is our number one concern".