Idaho was one of only nine U.S. states to execute inmates in 2012, the lowest number in two decades.
Idaho executed 53-year-old Richard Leavitt on June 12, one of 43 American prisoners who were executed this year. Leavitt was convicted of the 1985 stabbing death of Danette Elg in her Blackfoot home. After spending most of his incarceration appealing his conviction and sentence, the U.S. Supreme Court denied his final plea and Leavitt was put to death in June, using a fatal dosage of pentobarbital.
Texas, Arizona, Oklahoma and Mississippi accounted for more than three-quarters of the nation's executions.
Thirty-three states still have the death penalty, although fewer and fewer are using it, according to a report released Tuesday by a nonprofit company that tracks death penalty data.
"There are still 33 states with the death penalty, but very few are actually regularly carrying out executions," said Richard Dieter, executive director of the Death Penalty Information Center and author of the report, told Reuters.