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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
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- 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.
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
The Sacrifice · Felonious
Yarmouth Police Department has lost 2 officers; 1 of them killed feloniously.
Sean is one of 199 officers killed feloniously in MA, 42.4% of the 469 remembered there.
Sean is one of 15,743 officers killed feloniously in the United States, 57.1% of the 27,551 remembered there.
Sean is one of 17,631 officers killed feloniously worldwide, 51.7% of the 34,117 remembered here.
34,117 officers are remembered on this memorial. Each number below is one of them.
Time
In 2018, 3 officers in MA were killed feloniously, the 14th heaviest of 107 years on record. The heaviest was 1908, with 6.
In 2018, 66 officers in the United States were killed feloniously, the 109th heaviest of 213 years on record. The heaviest was 1921, with 248.
In 2018, 69 officers worldwide were killed feloniously, the 109th heaviest of 265 years on record. The heaviest was 1921, with 516.
Who
Sean was 32. Of the 195 killed feloniously in MA whose age is recorded, half were between 34 and 52.5; the middle age was 42. Sean had served 7.7 years; the middle length of service was 11 years.
Sean was 32. Of the 14,220 killed feloniously in the United States whose age is recorded, half were between 31 and 47; the middle age was 38. Sean had served 7.7 years; the middle length of service was 6 years.
Sean was 32. Of the 15,854 killed feloniously worldwide whose age is recorded, half were between 30 and 46; the middle age was 38. Sean had served 7.7 years; the middle length of service was 6 years.
When
April holds 6% of these deaths in MA; October holds the most, 10.6%. Thursdays: 13.6%.
April holds 8.4% of these deaths in the United States; December holds the most, 9.4%. Thursdays: 14%.
April holds 8.6% of these deaths worldwide; December holds the most, 9.2%. Thursdays: 14.1%.
How
Felonious deaths account for 50% of all 2 deaths at Yarmouth Police Department, the most common cause. The weapon recorded was gun; unknown type, in 100% of these deaths.
Felonious deaths account for 42.4% of all 469 deaths in MA, the most common cause. The weapon recorded was gun; unknown type, in 3% of these deaths.
Felonious deaths account for 57.1% of all 27,551 deaths in the United States, the most common cause. The weapon recorded was gun; unknown type, in 9.5% of these deaths.
Felonious deaths account for 51.7% of all 34,117 deaths worldwide, the most common cause. The weapon recorded was gun; unknown type, in 8.5% of these deaths.
His people
Yarmouth Police Department has 2 officers remembered here, Sean among them.
Where
Where the Name Is Cut
National Law Enforcement Officers Memorial · Panel 40-W
What is kept
Photographs, film, sound and papers — what survived a life.
Others Who Wore This Badge
1 officer from Yarmouth Police Department are honored on badge.nw.
