United States of America
Headstone of Leo Hemmer

Leo Hemmer

Died October 12, 1925

Leo Hemmer.

How He Died
Manner Homicide
Cause Gunshot wound
Mechanism Firearm
What Happened

Jailer Leo Hemmer was shot and killed as he brought food to the prisoners he was guarding at the Dubuque County Jail at 36 East 8th Street in Dubuque. Around 7:00 a.m., when Jailer Hemmer opened the door to a holding area to deliver food, he was jumped by three prisoners, one of whom pulled a revolver out of his pocket and shot and killed Jailer Hemmer. It is unknown how the revolver was smuggled into the jail. One of the suspects was arrested later that day. Three weeks later, deputies surrounded a house in Clinton, Illinois, where Jailer Hemmer's killer and another suspect were found to be hiding. The killer shot and killed himself. The other 20-year-old suspect surrendered. He was convicted of murder and sentenced to life. He was paroled on April 4, 1936. Jailer Hemmer was a United States Army WWI veteran and had served with the Dubuque County Sheriff's Department for eight months.

Survivors
He was survived by his wife, two children, his mother, and several brothers and sisters.
Media
Leo Hemmer
Leo Hemmer 0 views
Service Record
Also Served
Dubuque County Sheriff's Department
Jailer
Memorials
National Law Enforcement Officers Memorial Panel 2-W · Line 17 cut as LEO HEMMER
In Our Keeping
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Record added August 2, 2026 neuraweb.nw
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Last updated August 2, 2026

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In tribute

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.

Jailer Hemmer served with the Dubuque County Sheriff's Department.

Thank you for your service to the Dubuque community, and for your service before it. Gone but never to be forgotten.

Rest easy, brother.

— S. Vincent Anthony, U.S. Army 1985-1993

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