Robert McLean Hamilton, an officer with the Turtle Creek Borough Police Department, was shot and killed on April 4, 1919, while pursuing two men who had just robbed a restaurant.
Hamilton, a US Army veteran of World War I who had just been discharged from service, was serving his first day on the police force.
Andrew Graylock and Charles Campbell were arrested on May 4, 1919. Graylock was convicted of second-degree murder on May 14, 1920.
State Killings in the Steel City: The History of the Death Penalty in Pittsburgh 