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In the early 1900s Chicago police officers seem to have concealed their revolvers under their coats. By the mid-1920's they were openly wearing gunbelts and holsters.

Source:

Policeman, Thomas A. Lanan, standing with his pistol drawn [1915]. DN-0063899, Chicago Daily News negatives collection, Chicago History Museum; search the photo ID number at the American Memory web site for more information.)

The Cab-Hold-Up Affair / 10

The Shooting / 1

Murphy saw the cab at almost exactly the same place where George Morris was attacked two hours earlier. The policeman shouted for the cab to stop but O'Brien ignored him. As the horse galloped past, Murphy drew his revolver and shot at the fleeing cab. He later claimed that the bandits returned his fire.

One of Murphy's bullets struck Kane in the back of the head, killing him instantly. Simonds, sitting beside Kane, was splashed with blood.