Shannon bo
Chirping
If your coop isn't predator proof, it could be any critter who likes chicken. Make the coop totally safe, and set live traps around it, and shoot anything that you trap, unless it's the neighbor's cat or something. Rats are unlikely to kill an adult hen and are nearly impossible to trap. It could have been an opossum, but it's hard to be sure. Mary
Is it possible she just blew out from laying an egg?