Today, I went in the coop to get eggs and found a dead hen laying on the ground. Her beak was open, so she must have died panting. I don't know what the temperature was, but it got pretty hot today. It wasn't quite 100, but in the mid or high 90's. I don't understand why she would have died from heat though. They all free range during the day, and have plenty of shade and fresh water.. Do you think she could have died from heat?