Crow Killer: The Saga of Liver Eating Johnson is the book that inspired Jeremiah Johnson:
One May morning in 1847, Crow Indians killed and scalped John Johnston's pregnant wife; for many years thereafter, he killed and scalped Crow Indians. Then he ate their livers, raw.He ate them not for hunger's sake but upon principle - just what principle, his whole life's history may suggest. Other tribes than the Crows could arouse his anger; the Blackfeet indeed once shamed and mistreated him, their captive; but one tribe only did Johnston dreadfully humiliate. He was Dapiek Absaroka, the Killer of Crows.