Marshal Hanfeld was shot and killed at 0700 hours on Saturday, March 15, 1930, while attempting to arrest two youths, ages 16 and 17, who had just robbed a gas station in Luxemburg. One of the boys fired a shot as they drove by Marshal Hanfeld, striking him in the heart. Both were apprehended two hours later by police in East Dubuque, Illinois.

Both suspects were convicted of first degree murder and sentenced to life in prison. On January 18, 1934, Governor Clyde Herring commuted their sentences to 20 years.

Marshal Hanfeld was 47 years old and had served with the Dyersville Police Department for 15 years.

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