Black Jack Ketchum was the only person ever hanged in Union County, New Mexico. He was also the only person who suffered capital punishment for the offence of "felonious assault upon a railway train" in the State of New Mexico.

Later, the law was found to be unconstitutional, but way too late for Black Jack. According to the annals of American Jurisprudence at the time, he was the only criminal decapitated during a judicial hanging in the U.S.

..'However,...