Sergeant Dennis J. Whalen was shot by a bandit at 1549 East Eighteenth Street December 31, 1923. He died of his injuries January 1, 1924.

Sergeant Whalen joined the police department in 1889, and had served as a beat patrolman, a special guard, and an executive officer. On April 30, 1913, he was responsible for the capture of the two men who had killed Officer Andrew Lynch..