Trial of confessed murderer (and newly returned LDS missionary) Howard Egan. His lawyer Apostle George A. Smith popularizes phrase "mountain common law" and argues: "The man who seduces his neighbor's wife must die, and her nearest relative must kill him!" Fifteen minutes later jury finds Egan not guilty of murder. Church authorities print Smith's closing argument in Deseret News, in two pamphlets, and later in the Journal of Discourses 1:97. Egan is one of Brigham Young's enforcers.
[Source: The Mormon Hierarchy - Extensions of Power by D. Michael Quinn, [New Mormon History database (http://bit.ly/NMHdatabase)]]