Roll of Honor
Incident
Constable William Mason and Constable Paul Kisselbach were shot after responding to a man with a gun call at a tavern at 4201 Trendley Avenue. While investigating an unrelated stabbing in the area which occurred an hour earlier, the constables were called to the tavern at 3:30 am where a man had been brandishing a gun. Upon their arrival, the suspect began shooting, striking all three constables with a .38-caliber revolver before fleeing.
The constables were transported to St. Mary's Hospital where Constable Kisselbach, who was shot in the head, succumbed to his wound. Constable Mason, who was shot in the abdomen, died of his wounds six days later. The third constable survived his injuries. The suspect was later apprehended, convicted of murder, and sentenced to 99 years. Constable Mason had served as a constable in Centreville Township for four years.
Constable William Mason and Constable Paul Kisselbach were shot after responding to a man with a gun call at a tavern at 4201 Trendley Avenue.
While investigating an unrelated stabbing in the area which occurred an hour earlier, the constables were called to the tavern at 3:30 am where a man had been brandishing a gun. Upon their arrival, the suspect began shooting, striking all three constables with a .38-caliber revolver before fleeing.
The constables were transported to St. Mary's Hospital where Constable Kisselbach, who was shot in the head, succumbed to his wound. Constable Mason, who was shot in the abdomen, died of his wounds six days later. The third constable survived his injuries.
The suspect was later apprehended, convicted of murder, and sentenced to 99 years.
Constable Mason had served as a constable in Centreville Township for four years.
Survivors
He was survived by his wife.
In Our Keeping
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BO-US-IL-31C0C2E0- 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.
Constable Mason gave the Centreville Township Constable's Office 4 years.
Thank you for your service to the Centreville community. Gone but never to be forgotten.
Rest easy, Constable Mason.
— S. Vincent Anthony, U.S. Army 1985-1993
Agency
Service Record
Incident Details
Constable William Graham Mason 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 Centreville Township Constable's Office, 2 of 2 officers on record were killed feloniously — deliberately targeted and murdered in the line of duty — 100% of this agency's fallen.
National Cause Distribution
How Felonious compares to all causes of officer death in the memorial record. William Graham Mason's cause is highlighted.
How William Graham Mason Compares
When Felonious Deaths Occur
Monthly distribution of Felonious deaths across the full memorial record. William Graham Mason is highlighted in Sep.
Weapons Used Against Officers
Most common weapons in felonious officer deaths. William Graham Mason was killed by handgun; .38 caliber.
Incident Location
Others Who Wore This Badge
1 officer from Centreville Township Constable's Office are honored on badge.nw.
