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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- August 2, 2026
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- August 2, 2026
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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
The Sacrifice · Felonious
Valmore is the only officer of Marysville Police Department remembered here.
Valmore is one of 93 officers killed feloniously in MT, 65.5% of the 142 remembered there.
Valmore is one of 15,743 officers killed feloniously in the United States, 57.1% of the 27,551 remembered there.
Valmore is one of 17,631 officers killed feloniously worldwide, 51.7% of the 34,117 remembered here.
34,117 officers are remembered on this memorial. Each number below is one of them.
Time
In 1917, 2 officers in MT were killed feloniously, the 7th heaviest of 58 years on record. The heaviest was 1935, with 6.
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.
In 1917, 169 officers worldwide were killed feloniously, the 24th heaviest of 265 years on record. The heaviest was 1921, with 516.
Who
Valmore was 35. Of the 81 killed feloniously in MT whose age is recorded, half were between 33 and 47; the middle age was 39.
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.
Valmore was 35. Of the 15,854 killed feloniously worldwide whose age is recorded, half were between 30 and 46; the middle age was 38.
When
September holds 6.5% of these deaths in MT; December holds the most, 15.1%. Thursdays: 11.8%.
September holds 9.1% of these deaths in the United States; December holds the most, 9.4%. Thursdays: 14%.
September holds 8.8% of these deaths worldwide; December holds the most, 9.2%. Thursdays: 14.1%.
How
Felonious deaths account for 100% of all 1 deaths at Marysville Police Department. The weapon recorded was gun, in 100% of these deaths.
Felonious deaths account for 65.5% of all 142 deaths in MT, the most common cause. The weapon recorded was gun, in 35.5% of these deaths.
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.
Felonious deaths account for 51.7% of all 34,117 deaths worldwide, the most common cause. The weapon recorded was gun, in 20.4% of these deaths.
Where the Name Is Cut
National Law Enforcement Officers Memorial · Panel 39-E
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