So our chickens are about 9 months old or so and have been very healthy and no issues thus far. Then tonight suddenly one is dead. They were all fine this morning before I left for work and I only had a quick second to check on them when I came home to grab the eggs before dark. All seemed well then, but I was in a hurry and didn't pay much attention. So my wife notices an opossum on the fence and decides to go and close the coop door(they are in a fully enclosed run) and comes in and says Lola is still out and hunkered down in a corner. Stupid chicken I say! So we go out and grab here and go to put her on the roost and she falls off, ***?Take her inside and shes not breathing heavy, eyes look clear, but will only open one. Then suddenly she jerks, poops a very liquid poop with blood in it, and liquid starts flowing out her mouth then her nostrils and then that's it, she's gone. This all happened in a matter of about 2 minutes. So I'm looking for any thoughts on this. As I said, they have been very healthy and active. No change in food or anything like that, same stuff they've been getting all along. Seemed fine this morning and no odd behavior until now. Just want to know if I'm facing something that could threaten the rest of the flock(5 others) that needs immediate attention to stop. Thanks in advance for your input.