Welcome to BYC! I'm so sorry about your loss
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Yes, that's what has us stumped. We thought a cat maybe since it left the body, but I read that they don't usually attack full grown birds and I can't picture a cat attacking six chickens at once. I would have thought a fox or racoon would have gotten something to eat for its troubles.Welcome to BYC. I'm sorry for your loss.
It sounds like a dog, but if it came in through the top, that isn't possible.
Pictures of your run would be very helpful. If you can, use a game camera in the area.
I would lock them in the coop, when you are not home, until you can figure out what is getting in.
Hello and welcome to BYC! Glad you joined.
Sorry for you loss.
I agree with @janiedoe about posting some pictures of your setup. The basic rule is that the birds should be contained in a coop and run with no openings larger than 1/2". Some of the nastiest predators can get through holes as small as 3/4".