I woke up this morning to my Silver Laced Wyandotte dead in the coop. She was barely a year old. Up until finding her dead she seemed very healthy, like a normal chicken. She had laid an egg the day before. I just want to make sure that this isn't a sign of anything that could pose a threat to my other chickens. I don't want to start finding chickens dead all over the place. Are there any signs of disease that I could check the body for? Anything I could do? Down to 7 Chickens now. I've considered that it might have been a heart attack or something of that nature.