Until this morning, I've had 8 chickens: 7 hens and a rooster. They were born approximately 9 months ago, April 1st. They've been laying fine, and are staring to slow down due to the cold New England weather. Yesterday was particularly warm for the time of year, so we let them out to free-range for the day. However, when we opened the coop door yesterday, there were blood splatters all throughout the coop: walls, waterer, roosts, and all. They live in a coop as secure as Fort Knox, which we lock up every night, so the blood was extremely peculiar. We inspected every chicken; not one had any visible signs of injury and all free-ranged throughout the day perfectly normally. We decided to let bygones be bygones, and put the birds away that night. This morning was warm again, so we went to let the birds out. We opened the door to find one of the 7 hens sprawled dead in the center of the floor. There were no easily visible signs of injury, but alas, Roxie was dead. She was again, about 9 months old, fairly large (probably the largest of the 7 hens), a Bard Rock, and had been laying eggs since late August. If anyone has any ideas as to the cause of either the blood in the coop or the girl's death, please let me know. Thank you.