On January 27, 1973, Trooper Robert M. Semrov was shot and killed on January 27, 1973, after making a vehicle and traffic stop on East Lake Road near Richfield Springs. Trooper Semrov allowed the driver to enter his home to retrieve a driver's license. The subject emerged with a .22 caliber rifle and shot at Trooper Semrov though the windshield of the Troop car, blinding him with fragments of glass. The subject then shot Trooper Semrov five times in the neck and head. Trooper Semrov, near death, managed to struggle with the suspect, but collapsed and died from his wounds.
Trooper Semrov joined the Division of State Police on June 19, 1967, and was assigned to the Richfield Springs Station at the time of his death.