Constable

Valmore De Rosier

Marysville Police Department — Marysville, MT
Felonious
End of Watch September 13, 1917
Age 35
The Vigil Panel 33 ›
Gender Male

Incident

Constable Val De Rosier was shot and killed in the line of duty. At approximately 3 a.m. Constable De Rosier and Dennis Shea, Marysville mine foreman, heard an explosion and after searching locations nearby came to a local saloon where the suspects began firing immediately. The first shot struck Constable De Rosier in the hand, and as he was attempting to find cover the shooters continued to fire 13 to 15 shots upon him, striking him in the abdomen. Mr. Shea fled in a different direction and called for assistance. It is believed Constable De Rosier died at the scene. The shooters were able to escape through the confusion and it is believed that the car was spotted in nearby Helena soon after the shooting but this was never confirmed. Constable De Rosier was survived by his mother, three sisters, three brothers,

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.
Constable De Rosier served with the Marysville Police Department.
Thank you for your service to the Marysville community. Gone but never to be forgotten.
Rest easy, Constable De Rosier.

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

Agency

Type Police Department
Location Marysville, Lewis and Clark County, MT
Platform Identity mpd.lewisclark.mt.us.gov.nw

Service Record

End of Watch September 13, 1917
Age 35
Gender Male

Incident Details

Cause Felonious
Weapon Gun

The Sacrifice · Felonious

Valmore is one of 15,743 officers killed feloniously in the United States, 57.1% of the 27,551 remembered there.

33,917 officers are remembered on this memorial. Each number below is one of them.

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Compare against
I

Time

In 1917, 165 officers in the United States were killed feloniously, the 19th heaviest of 213 years on record. The heaviest was 1921, with 248.

Every year on record · United States
II

Who

Valmore was 35. 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.

Age at death
Where he stood among them
Age by years of service
III

When

September holds 9.1% of these deaths in the United States; December holds the most, 9.4%. Thursdays: 14%.

By month
By day of the week
IV

How

Felonious deaths account for 57.1% of all 27,551 deaths in the United States, the most common cause. The weapon recorded was gun, in 22.8% of these deaths.

Every cause
Weapons recorded

Constable Valmore De Rosier

Marysville Police Department · End of Watch September 13, 1917

Where the Name Is Cut

National Law Enforcement Officers Memorial · Panel 39-E

Others Who Wore This Badge

0 officers from Marysville Police Department are honored on badge.nw.

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