Detective Hagan was shot and killed when he and his partner approached three men they believed were carrying weapons in the area of 167th Street and Vyse Avenue. As the detectives began to question the men one of them dropped a blackjack. When Detective Hagan bent down to pick it up the man drew a pistol and shot him twice, killing him.
All three men were arrested. The suspect shot Detective Hagan was sentenced to death and executed by electric chair on February 4, 1926.
Detective Hagan was survived by his wife and daughter.