Wendigo-Native American legend of a creature that has an insatiable greed for cannibalism. Once they take a bite of human flesh they can't seem to get enough.
Sometimes associated with owl. Antlers seem to appear in the tales as well. There are actual documented cases of people being stricken and having to be put down because there was no cure. Lots of legends across different tribes but basically the same.
Someone with better research skills might do better.