anyone know what could have happened?

[obxbum]

so i went to feed the chickens. filled the feeders and waterers. I have a one year old hen that was eating and drinking with no issues and no symptoms die 10 minutes after i walked away. none of the other chickens did it. they all get along great. heart attack?

 

[thebanthams]

so sorry ! I wish I knew what happen to her ! It happens to me few times. Hope some else knows . Mine will look healthy and the next dropped down ! so sad !