Honken, of Britt, Iowa, had been on death row since 2005 and was the first Iowan with a death sentence imposed by Iowa jurors to be executed since 1963. Iowa struck the death penalty from state statutes in 1965, but Honken was eligible for the death penalty under U.S. law because he was tried in federal court.
Honken was pronounced dead at 4:36 p.m., the Bureau of Prisons said.