Young student went missing from school couple of years ago in Colorado. If memory serves, he was attacked and killed by a young, healthy cougar while walking on a path through the hills behind the school. When authorities found the body the face was missing and a considerable portion of the body consumed. This was in an area where those who had complained that the growing boldness of indigent cougars was endangering pets and humans were shouted down by local tree-huggers who most vehemently opposed any attempts to reduce their numbers.
The old saw about "only the old" attack humans is being proved untrue, as more and more cougars, now largely free of any "threat" from humans, increasingly lose their fear of us, and begin to see us as just another type of prey.