My favorite chicken, a one+ year old barred rock, died today. I let the birds out of the coop this afternoon as I always do. She looked great, acted like normal. When I went out to secure them for the night she wasn't around. I searched the grounds and found her dead and totally intact. I looked her over well and found no bugs, no wounds, no anything. She was wormed a month ago and has been acting like her perky self. Do laying hens die of heart attacks like meaties at an early age sometimes? Should I give the others some type of medicine? She was not eggbound as she layed today and every day this week.