I thought I'd give the chickens a treat this afternoon so I cooked up some spaghetti, my wife and I started feeding the flock with the treat and about half way through the treat I noticed one adult hen came out of the coop so I brought a small handful of spaghetti to her and dropped it in front of her, she was panting a bit so I thought she was just hot, it was about 85. As I walked away I looked at her hind end and noticed she had something red coming out of her, I thought she was getting ready to lay an egg, so I just shrugged and started walking away, as I turned I heard fluttering so I turned back around to see what she was doing and she just flopped on her back and kicked her feet a couple times and died. What a shock, I've never witnessed this before. After she passed she oozed a little bit of blood from her vent. Sorry still in shock and wondering what just happened, any ideas?