Orson Whitney in his History of Utah writes that John Doyle Lee was offered clemency if he implicated Church leadership for the massacre.
Orson F. Whitney, History of Utah, 4 vols. (Salt Lake City: George Q. Cannon and Sons, Co., 1893) 2:824
An appeal was taken in the Lee Case to the Supreme Court of the Territory, where it was argued on January 31st, 1877. The action of the lower court was affirmed on February 10, and on the 7th of March Judge Boreman fixed Friday, March 23, as the date for carrying out the judgment of the court. A move to obtain a reprieve was inaugurated, the basis of executive clemency being that Lee should make a statement implicating the Mormon leaders; but this he could not do, the facts being plainly against such an allegation, so the matter was dropped.