Thomas J. Riley
Agency patch
Patrolman

Thomas J. Riley

Cambridge Police Department — Cambridge, MA
Felonious
End of Watch November 20, 1920
Age 34
Tour of Duty 8 yrs
The Vigil Panel 40 ›
Gender Male

Incident

Patrolman Riley was shot and killed while trying to disperse a group of drunk men. As he turned to leave one of the men produced a revolver and shot Patrolman Riley in the head. Patrolman Riley had been with the agency for eight years. A 25-year-old suspect was arrested, convicted of murder, and sentenced to death. Governor Channing H. Cox commuted his sentence to life. He was pardoned on December 24, 1953.

In Our Keeping

Permanent identifier
BO-US-MA-3C5F9B6F
Stewardship
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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.
Patrolman Riley gave the Cambridge Police Department 8 years.
Thank you for your service to the Cambridge community. Gone but never to be forgotten.
Rest easy, Patrolman Riley.

— S. Vincent Anthony, U.S. Army 1985-1993

Agency

Type Police Department
Location Cambridge, Middlesex County, MA
Platform Identity cambpd.middlesex.ma.us.gov.nw

Service Record

End of Watch November 20, 1920
Tour of Duty 8 yrs
Age 34
Gender Male

Incident Details

Cause Felonious
Weapon Handgun

Patrolman Thomas J. Riley 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 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 Cambridge Police Department, 3 of 12 officers on record were killed feloniously — deliberately targeted and murdered in the line of duty — 25% of this agency's fallen.

Cambridge Police Department
3
of 12 officers
25% Felonious
MA — Statewide
199
of 469 officers
42.4% Felonious
Nationwide
1
of 97,772 officers
0% Felonious

National Cause Distribution

How Felonious compares to all causes of officer death in the memorial record. Thomas J. Riley's cause is highlighted.

Felonious
1 (0%)
Accident
1 (0%)
Illness
1 (0%)
Cardiac
1 (0%)
Undetermined
1 (0%)
Suicide
1 (0%)

How Thomas J. Riley Compares

Age at Death
34
This officer
Avg for Felonious: 39.0 years
Years of Service
8
This officer
Avg for Felonious: 8.4 years

When Felonious Deaths Occur

Monthly distribution of Felonious deaths across the full memorial record. Thomas J. Riley is highlighted in Nov.

Jan
1,392
Feb
1,295
Mar
1,373
Apr
1,516
May
1,504
Jun
1,442
Jul
1,587
Aug
1,517
Sep
1,491
Oct
1,371
Nov
1,447
Dec
1,624

Weapons Used Against Officers

Most common weapons in felonious officer deaths. Thomas J. Riley was killed by handgun.

Handgun
3,684
Gun
3,592
Gun; Unknown type
1,492
Shotgun
1,109
Rifle
935
Officer's handgun
909