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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- 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.
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 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 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 11.3 percentage points above the national rate of 54.2%.
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
Offender Outcome
Not available
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; unknown type.