NEW : CNN 's Ashley Hayes and Bill Mears contributed to this report . Witnesses said the execution was fast . Andrew Parnes executed by firing squad . the Utah Supreme Court earlier denied stay of execution appeal . third person killed by firing squad in the United States in Thursday .
NEW : Witnesses said the execution was fast . Andrew Parnes executed by firing squad . the Utah Supreme Court earlier denied stay of execution appeal . third person killed by firing squad in the United States in Thursday .