Roll of Honor
Incident
Sergeant Sean Gannon was shot and killed while assisting with a warrant service at 109 Blueberry Lane, in Barnstable.
Sgt. Gannon and his canine partner, Nero, were searching the home and located the wanted man in a closet. The man opened fire, fatally wounding Sgt. Gannon and wounding Nero. The man then barricaded himself inside the house for two hours before being taken into custody.
The 29-year-old subject was charged with Sgt. Gannon's murder. His record showed he had 111 prior offenses and was on probation. In August 2021 the man was convicted of second-degree murder, assault and battery with a dangerous weapon, possession of a firearm without a license, and interfering with a police canine.
Sergeant Gannon had served with the Yarmouth Police Department for 7-1/2 years and previously served with the Stonehill College Police Department and Nantucket Police Department.
Survivors
He is survived by his wife, parents, brother, and sister.
In Our Keeping
- Permanent identifier
BO-US-MA-12294634- Stewardship
- Maintained by NeuraWeb Global Inc.
- Added to badge.nw
- August 2, 2026
- Last updated
- August 2, 2026
Honored here by 1 sentinel - 1 tribute.
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Tributes
I never knew you. I am standing here anyway.
Sergeant Gannon gave the Yarmouth Police Department 7 years.
Thank you for your service to the Yarmouth community. Gone but never to be forgotten.
Rest easy, Sergeant Gannon.
— S. Vincent Anthony, U.S. Army 1985-1993
Agency
Service Record
Incident Details
Sergeant Sean McNamee Gannon 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 97,756 officers honored here.
In MA, 199 of 469 officers were killed feloniously — deliberately targeted and murdered in the line of duty — 42.4% of this state's fallen. That is 42.4 percentage points above the national rate of 0%.
At Yarmouth Police Department, 1 of 2 officers on record were killed feloniously — deliberately targeted and murdered in the line of duty — 50% of this agency's fallen.
National Cause Distribution
How Felonious compares to all causes of officer death in the memorial record. Sean McNamee Gannon's cause is highlighted.
How Sean McNamee Gannon Compares
When Felonious Deaths Occur
Monthly distribution of Felonious deaths across the full memorial record. Sean McNamee Gannon is highlighted in Apr.
Weapons Used Against Officers
Most common weapons in felonious officer deaths. Sean McNamee Gannon was killed by gun; unknown type.
Incident Location
Others Who Wore This Badge
1 officer from Yarmouth Police Department are honored on badge.nw.
