I'm sorry about your loss. I had a similar experience today, and am wondering what happened. One of my 4 Wyandotte's died this evening. (They are the only chickens I have, and will be one year old this month.) I found her stretched out under the quince bush when I went out to check them one last time for the night. I'm trying to determine why she died, to do what I can to protect the other 3. There were no marks on her at all, and earlier today she seemed just fine. They have plenty of room to roam within their fenced area. They have grass, a compost pile, lots of mulch (hardwood and pine chips) to scratch in, a large quince bush for cover, and an enclosed, dirt floor pen with food, water, nest box, grit, oyster shell, and roost bars (it's open during the day and closed at night). Four nights ago, they all refused to go into the pen, and have been sleeping out ever since. I've changed all the pine shavings in the nest box, raked out the accumulated poop and spilled feed from the ground, and put down leaves I saved from last fall. They still won't go in to sleep there, but they are still laying in the nest box. I don't know if that has any bearing on why she died or not. Any idea why she might have died, or what I can look at on her (before I bury her) to possibly determine how she died? Thanks in advance for any suggestions you have. Susan