Trooper Klinkefus was killed Wednesday, May 18, 1949, in an automobile accident when his cruiser was struck by a tractor trailer on US 34 near Red Oak. Another car attempted turn left and the truck attempted to stop suddenly in order to avoid a collision. The truck jack-knifed and struck the side of Trooper Klinkefus' car, causing him to be ejected.

Trooper Klinkefus had served with the Iowa State Patrol for 6 years.

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