Roll of Honor
Incident
Patrolman Patrick J. O'Neill was shot and killed at 10:00 pm in the rear of 6415 Washtenaw Avenue as he and several other police officers attempted to make an arrest. When Patrolman O'Neill and fellow officers surrounded the building, the gunman ran out the rear door and opened fire. Patrolman O'Neill suffered multiple gunshot wounds and succumbed to his injuries at 11:30 pm the same day. The brother-in-law and sister of the killer were arrested and, on April 22, 1921, indicted on the charge of accessory to murder. On July 30, 1921, the killer was arrested in St. Paul, Minnesota. On September 28, 1921, the case against the killers. The brother-in-law and sister were nolle prossed (dismissed.) On October 14, 1921, Officer O'Neill's killer was sentenced to hang on December 15, 1921. He escaped from the County Jail on December 11, 1921. He was never recaptured; It was reported that he died in 1951. In 1927 the suspect was responsible for planning a robbery of a pharmacy in Detroit, Michigan. A gunfight resulted in the deaths of the two suspects and Officer Stacey C. Mizner of the Detroit Police Department. Patrolman O'Neill had served with the Chicago Police Department for over 14 years assigned to the Detective Bureau.
Survivors
He was survived by his wife and three children.
In Our Keeping
- Permanent identifier
BO-US-IL-94600E03- Stewardship
- Maintained by NeuraWeb Global Inc.
- Added to badge.nw
- August 2, 2026
- Last updated
- August 2, 2026
Honored here by 1 tribute.
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Tributes
I never knew you. I am standing here anyway.
Detective Patrolman O'Neill gave the Chicago Police Department 14 years.
Thank you for your service to the Chicago community. Gone but never to be forgotten.
Rest easy, Detective Patrolman O'Neill.
— S. Vincent Anthony, U.S. Army 1985-1993
Agency
Service Record
Incident Details
Detective Patrolman Patrick J. O'Neill is one of 1 officers killed feloniously — deliberately targeted and murdered in the line of duty across the full record of this memorial — 0% of all 97,772 officers honored here.
In IL, 842 of 1,318 officers were killed feloniously — deliberately targeted and murdered in the line of duty — 63.9% of this state's fallen. That is 63.9 percentage points above the national rate of 0%.
At Chicago Police Department, 396 of 571 officers on record were killed feloniously — deliberately targeted and murdered in the line of duty — 69.4% of this agency's fallen.
National Cause Distribution
How Felonious compares to all causes of officer death in the memorial record. Patrick J. O'Neill's cause is highlighted.
How Patrick J. O'Neill Compares
When Felonious Deaths Occur
Monthly distribution of Felonious deaths across the full memorial record. Patrick J. O'Neill is highlighted in Mar.
Weapons Used Against Officers
Most common weapons in felonious officer deaths. Patrick J. O'Neill was killed by gun.
Incident Location
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