We lost another chicken this week. I say lost, but she was quite easily found, just not alive. She was laying in the run when I went out to check on them. Rigor mortis was complete, so she probably passed during the night. From a quick web search rigor mortis in chickens completes within a few hours of death, and can last 8-24 hours. She was walking around and eating the day before, so sometime late evening or early morning her ticket was punched. No signs of distress or abnormalities, I did not do a necropsy since they are four years old. The other chickens are unconcerned.