East Chicago Police Department, Indiana
End of Watch: Thursday, May 24, 1934
Age: 44
Tour of Duty: 13 years
Badge Number: Not available
Cause of Death: Gunfire
Date of Incident: May 24, 1934
Weapon Used: Rifle; Machine gun
Suspect Info: The Dillinger Gang
Patrolman Martin O'Brien and Patrolman Francis Mulvihill were shot and killed at approximately 11:15 p.m. by four men believed to be part of the Dillinger Gang. The officers were patrolling a rural section of the old Gary Road when they stopped to talk with four men standing next to a car. Without warning, the suspects opened fire with machine guns, striking both officers multiple times. The suspects then fled the scene.
Patrolman O'Brien had served with the East Chicago Police Department for nearly 14 years. He was survived by his wife and three children.