I live in NWPA...just normal whitetail deer, turkey, bear, coyotes, fox. We have tons or farmers in the area...but, I'd say it was a roadkill that probably got drug there.
It's been Skull capped so I would say a Buck that either a nieghbor or someone killed and retrieved the antlers and discarded the head. And if thats all of the carcuss thats there it was probably carried there by scavengers.