Heat Stroke?

Lee found one of the April 17 chicks behind the AC unit today. It did not appear to be foul play...intact and no ruffled feathers anywhere. It had been left out accidentally Friday night and was outside the coop door Saturday morning. Last I saw it was Saturday morning when it was resting underneath the lantana with the other chicks. I wonder if it was stressed out from being by itself all night and was just overcome by the heat. Poor thing. Sucks too that it was our only mille fleur colored chick. Now all the chicks we have are black and white.