After raising my chickens for the last 2 1/2 years since they were a day old, I walked out to them this morning and found one of them dead. They are in an enclosed run from top to bottom. No predators can get in. We are in the city. She appeared healthy yesterday afternoon, she laid an egg. The only unusual thing I saw was a small blood drop and smudge on the hanging feeder. Her body was about 2 feet away. We didn't see any signs trauma on her body.