Roll of Honor
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,
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BO-US-MT-2CA481B7- 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.
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
Service Record
Incident Details
Constable Valmore De Rosier 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 97,775 officers honored here.
In MT, 93 of 142 officers were killed feloniously — deliberately targeted and murdered in the line of duty — 65.5% of this state's fallen. That is 65.5 percentage points above the national rate of 0%.
National Cause Distribution
How Felonious compares to all causes of officer death in the memorial record. Valmore De Rosier's cause is highlighted.
How Valmore De Rosier Compares
When Felonious Deaths Occur
Monthly distribution of Felonious deaths across the full memorial record. Valmore De Rosier is highlighted in Sep.
Weapons Used Against Officers
Most common weapons in felonious officer deaths. Valmore De Rosier was killed by gun.
Others Who Wore This Badge
0 officers from Marysville Police Department are honored on badge.nw.