Milwaukee Police Department, Wisconsin
End of Watch: Saturday, November 24, 1917
Age: 53
Tour of Duty: 20 years
Badge Number: Not available
Cause of Death: Bomb
Date of Incident: November 24, 1917
Weapon Used: Explosives; Bomb
Suspect Info: Case never solved
Police Officer David O'Brien was killed when a bomb exploded in the department's Central Police Station.
Officer O'Brien had served with the Milwaukee Police Department for 20 years. He was survived by his second wife, two sons, and his mother. He was predeceased by his first wife and infant daughter. He is buried in Calvary Cemetery and Mausoleum, Milwaukee, Wisconsin.