I would guess it is the work of an evil raccoon, they murder for fun, and after they have hit, the area looks like a crime scene! So sorry for your loss.
I'm new to chickens, but everything I've read says that raccoons will slaughter the entire flock if they get inside. So my first bought would be a raccoon as well.
What I did after loosing one of my birds was put a live trap along the side of the coup, assuming predators will circle the coup looking for an entrance before trying to claw their way in by brute force, and wander right into it. I didn't even use bait. Within a week I caught an opossum. It could have been luck, but I think my theory is sound. The opposum probably thought he had found a way inside. Most animals don't even want to go inside a baited live trap cage, but when they are trying to get inside a cage to eat chickens, then they are a lot easier to trap!
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