The 39-year-old trooper was standing outside his vehicle at the time.
Popp was rushed to a nearby hospital where he later succumbed to his injuries.
The driver, 81, suffered serious injuries but is expected to survive.
The 39-year-old trooper was standing outside his vehicle at the time.
Popp was rushed to a nearby hospital where he later succumbed to his injuries.
The driver, 81, suffered serious injuries but is expected to survive.