What Killed My OEG Bantam Hen? Warning the picture might be disturbing to some viewers.

So this evening when I went out to close my coup I noticed my Old English Game Bantam hen was missing. It has been missing before or hiding in places so I wasnt too concerned right off. I looked in all the usual spots it liked to be with no luck. After walking the perimeter of the 70'x45' run I located the poor little thing caught in the fence with its head raw missing practically all of the feathers. I have a significant amount of standard size birds so I am guessing one or some killed my little hen? Here is a pic of what I found: