Frank J. Cannon (with George L. Knapp) asserts that Orrin Porter Rockwell and the SLC police killed three men for blood atonement in 1862.
Frank J. Cannon and George L. Knapp, Brigham Young and His Mormon Empire (New York: Fleming H. Revell Company, 1913), 324
This was another case in which the rude interpreters of the law of blood atonement went farther than the emperor desired; and on this occasion, Brigham thought best to punish such inopportune exhibitions of religious zeal. One of the fellows concerned in the outrage was shot by "Port" Rockwell, January 16, 1862, "while attempting to escape from the officers." Two others were killed by the police of Salt Lake City the next day, and their taking off was explained in a similar manner.