Farr vaguely (and approvingly) mentions the Parrish-Potter murders.
Winslow Farr diary, 1856 May-1899 September, entry for March 19, 1857, 25, MS 1743, Church History Library
Thursday 19th I spent most of the day in hunting cows but did not find them grubed some willows in the afternoon went to the evening Meeting I heard some good preaching and was glad to hear that the law of God has been put in force in Springville on Some men who deserved it