It’s possible a hawk or another predator killed the chicken, had a few bites and left the body for scavengers (maybe a buzzard, rats or chickens).
If you haven’t seen it happening it’s a guess. Examining the poop might give a clue.
And sorry for your loss
  of course.
	
		
			
		
		
	
				
			If you haven’t seen it happening it’s a guess. Examining the poop might give a clue.
And sorry for your loss
  of course.
	