I've heard of it happening, one of those a friend of a friend kind of stories. I don't doubt that it's happened before, but not that often. Here's the story that I've heard, regardless of whether or not it's true, it's kind of cool.

This friend of a friend shoots a buck from a stand right at the end of the day. He waits a bit to start tracking it down, but not too long because it'll be dark soon. Anyway, he starts tracking the blood in the snow with a flashlight. The red of the blood is easy to follow in the snow, so he's got his head down and moving quickly to find the deer. Apparently this guys walked right in to the buck, who was standing and facing him. At that moment the deer lounged at him with it's last ounce of energy, plowing with his antlers, and then dropped dead.

I've never heard of it happening other than that.