Chief George A. Airey of Chicago's Morgan Park Police Department was killed in the line of duty Halloween night 1903.
Chief Airey was killed when his throat was slit while responding to a citizen complaint. The complaint involved a small group of people creating a disturbance on Halloween night. When Chief Airey arrived he located the men attempting to destroy a section of sidewalk. When he attempted to stop the men he was attacked and his throat was slit.
Six suspects were arrested in connection with Chief Airey's murder. One of them was convicted and sentenced to death by hanging.

Chief Airey was survived by his wife and four children.
Read more: http://www.odmp.org/officer/16047-chief-of-police-george-a-airey#ixzz1j1EMJvxN

The Inter Ocean (Chicago, Illinois) - November 3, 1903
NEGROES HELD FOR HALLOWEEN MURDER
Woman and Two Men Must Face Grand Jury as Result of G. A. Airey's Death.
Two men and a woman were held to the grand jury yesterday on charges of murdering George A. Airey, chief of police of Morgan Park, in a quarrel on Halloween. The prisoners held are Mack Wiley, 20 years old, who is accused of wielding the knife; Mrs Hattie Payne, his sister, and James Payne, her husband. All are colored. three other prisoners were allowed to go.
A crowd of Morgan Park people attended the inquest, which was held at the Englewood police station.
For four hours witnesses and the prisoners told their version of the murder. An effort was made to show that the crime was premeditated. This had been charged by residents of Morgan Park, but close questioning failed to produce sufficient testimony to hold all the prisoners on charges of conspiring to kill.
Tells of Quarrel
Alonzo McPhee, who had been sworn in as a special policeman for Halloween night, testified that his superior officer struggled with the men when Mrs. James Payne was attempting to take his star. It was at this time, it was stated, that Wiley approached the police official from beside and stabbed him three times about the face and neck.
Later the star was found in the grass at Vincnnes road and Morgan avenue, where the struggle occurred. Aireys hat, mutilated and with the gold braid missing was also found near.
Wiley did not deny his quilt, and when asked if he wished to testify offered his written confession, made to Captain Shippy, as the story of the part he took in the crime.
Says She Was Struck
Mrs. Payne told how she had dressed in men's clothing earlier in the evening and, accompanied by three of her friends, had gone out to celebrate. She was removing boards from a sidewalk when she was accosted by Chief Airey and, according to other witnesses, was struck on the back by the police official when she ignored his orders. Two hours after this the murder was committed.
In the second meeting with the chief of police Mrs. Payne accused him of striking her and a quarrel followed, ending in the fatal stabbing of Airey.
At the close of the inquest the comments of those most bitter against the prisoners increased in severity until predictions were freely made that the colored people in the suburb would be driven away.
The funeral of the murdered officer will be held at the home, 1218 Church street, at 2 o'clock this afternoon