Roll of Honor
Incident
Marshal Alf Amundsen succumbed to a head injury sustained one week earlier when he was struck while arresting a man during a domestic disturbance. The suspect's daughter reported that the suspect was beating her mother, and Marshal Amundsen went to the home to investigate. He was struck when he entered the home, and a fight ensued. Marshal Amundsen subdued the suspect and placed him under arrest. While he was walking him out of the house, the suspect struck him again, and another fight began. The suspect was again restrained. That night, Marshal Amundsen developed a severe headache and was diagnosed with a brain hemorrhage. He succumbed to his injuries eight days later at the Sioux City Hospital. The suspect was found guilty of second-degree murder and sentenced to three years. Marshal Amundsen was a United States Army World War I veteran.
Survivors
He was survived by his wife, child, and brother.
In Our Keeping
- Permanent identifier
BO-US-SD-B33674DE- Stewardship
- Maintained by NeuraWeb Global Inc.
- Added to badge.nw
- April 2, 2026
- Last updated
- July 23, 2026
Honored here by 1 sentinel - 1 tribute.
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Tributes
I served 1985 to 1993. You served too, before the badge - different uniform, same idea. You go where you are sent and you do not get to pick the call.
Marshal Amundsen served with the Alcester Police Department.
Thank you for your service to the Alcester community, and for your service before it. Gone but never to be forgotten.
Rest easy, brother.
— S. Vincent Anthony, U.S. Army 1985-1993
Agency
Service Record
Incident Details
Military Service
Alf A. Amundsen served in the United States military before joining law enforcement. Full service record available on salute.nw.
Marshal Alf A. Amundsen 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 SD, 36 of 62 officers were killed feloniously — deliberately targeted and murdered in the line of duty — 58.1% of this state's fallen. That is 3.9 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. Alf A. Amundsen's cause is highlighted.
How Alf A. Amundsen Compares
When Felonious Deaths Occur
Monthly distribution of Felonious deaths across the full memorial record. Alf A. Amundsen is highlighted in Sep.
Weapons Used Against Officers
Most common weapons in felonious officer deaths.