I always like to see any bits of this kind of history come to light.
The Mormons who claim extreme persecution, arrived in Utah and forcefully pushed the Native Americans out of the way taking their lands as was the M.O. at this point. The fact that this was execution type killing is very telling of what was really going on. The fact that the official report says the Indians "gave fight" when the evidence says otherwise says a lot about the Mormon settlers.
And this is not isolated as we all know. What was done to the Timpanogos is heartbreaking.
my wife had a history teacher in college who had lived back east and spent some time in the national archives, and was able to tell the class about various atrocities including lining up native americans on the shore of Utah lake and gunning them down.