My husband just called and said when he got home from work one of our 25 week old sienna stars was just laying in the run dead. She was fine the previous night and seemed fine this morning but they were roosting when I fed them And pouring down rain. I put all their food and dry locations and everybody seemed fine. I can’t figure it out. I would think it was the heat if it were the past few weeks The last few weeks and has been in the 90s with close to unbearable humidity. But today everybody was excited because we got a small break from the heat. Only 82°. Still terrible humidity but the weather is 10 times better than it’s been for a while. I can’t figure it out. I would love to figure it out just so we don’t come home to this again. My husband also said there was no signs of any kind of injury and all the other chickens were fine