Roll of Honor
Incident
Police Officer John Callahan was killed when his motorcycle was struck by a vehicle being operated by an intoxicated driver. He was on patrol and was approaching the intersection of Highway 73 and Merritt Road when the vehicle struck him. The driver was arrested at the scene. He was convicted of vehicular homicide and sentenced to 10 years in prison and 20 years probation. Officer Callahan had served with the Maryville Police Department for five years.
Survivors
He was survived by his twin sons.
In Our Keeping
- Permanent identifier
BO-US-TN-5F81F7F8- Stewardship
- Maintained by NeuraWeb Global Inc.
- Added to badge.nw
- April 2, 2026
- Last updated
- July 23, 2026
Honored here by 1 sentinel - 1 tribute.
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Tributes
I never knew you. I am standing here anyway.
Police Officer Callahan gave the Maryville Police Department 5 years.
Thank you for your service to the Maryville community. Gone but never to be forgotten.
Rest easy, Police Officer Callahan.
— S. Vincent Anthony, U.S. Army 1985-1993
Agency
Service Record
Incident Details
Police Officer John Michael Callahan, II is one of 17,623 officers killed feloniously — deliberately targeted and murdered in the line of duty across the full record of this memorial — 54.2% of all 32,508 officers honored here.
In TN, 498 of 769 officers were killed feloniously — deliberately targeted and murdered in the line of duty — 64.8% of this state's fallen. That is 10.6 percentage points above the national rate of 54.2%.
At Maryville Police Department, 4 of 4 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. John Michael Callahan, II's cause is highlighted.
How John Michael Callahan, II Compares
Offender Outcome
Convicted of vehicular homicide
When Felonious Deaths Occur
Monthly distribution of Felonious deaths across the full memorial record. John Michael Callahan, II is highlighted in Feb.
Weapons Used Against Officers
Most common weapons in felonious officer deaths. John Michael Callahan, II was killed by automobile; alcohol involved.
Incident Location
Others Who Wore This Badge
3 officers from Maryville Police Department are honored on badge.nw.
