My GGG-Grandfather was part of the Fancher-Baker wagon train. Or at least, he was until Mormon terrorists killed him at Mountain Meadows for being a non-Mormon.
So you might want to start looking for a rat . . .
My GGGgrandfather was John D. Lee. He killed yours. I’m sorry, even though he was executed for his part of the massacre he could never atone for the crime with his blood - only Christ can. Mormonism is truly evil.