Roll of Honor
Incident
Marshal Frank Mommer was shot and killed when he interrupted two suspects attempting to break into a safe at a local drugstore. He confronted the two suspects inside the store but was shot in the stomach by one of them.
The two men fled the scene as local citizens came to Marshal Mommer's aid. He was taken to a hospital in Waterloo where he died the following day.
One of the suspects was apprehended several days later but the other suspect fled the area. The suspect who fled, who turned out to be the store owner's son, was apprehended in Vancouver, Washington, six years later. He was sentenced to life in prison on January 9, 1932. He was paroled September 3, 1952. The other suspect, also sentenced to life October 17, 1925, was paroled in 1941.
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BO-US-IA-3FEDC382- 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.
Marshal Mommer served with the Traer Police Department.
Thank you for your service to the Traer community. Gone but never to be forgotten.
Rest easy, Marshal Mommer.
— S. Vincent Anthony, U.S. Army 1985-1993
Agency
Service Record
Incident Details
Marshal Frank August Mommer, Sr. 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 IA, 129 of 226 officers were killed feloniously — deliberately targeted and murdered in the line of duty — 57.1% of this state's fallen. That is 2.9 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. Frank August Mommer, Sr.'s cause is highlighted.
How Frank August Mommer, Sr. Compares
Offender Outcome
Sentenced to life
When Felonious Deaths Occur
Monthly distribution of Felonious deaths across the full memorial record. Frank August Mommer, Sr. is highlighted in Aug.
Weapons Used Against Officers
Most common weapons in felonious officer deaths. Frank August Mommer, Sr. was killed by handgun.