Richards records that Brigham said execution by beheading is the law of the Lord for repeated sinners.
Willard Richards journals and papers, 1821-1854; Journals; Journal (volume 17), 1846 December-1847 April; Church History Library
& he [Brigham Young] would rather cross the mountains with the Twelve & not another person with them than be accompanied by a set of wicked men & those who continued to lie & steal & swear & commit iniquity & follow the camp would have their heads cut off — for that is the law of God & it shall be executed & I swear that I will not live amongst