I had a 1 year old buff orpington hen who died of a spontaneous liver rupture and subsequent internal hemorrhage; it was confirmed on necropsy. I know this sort of thing is typically associated with obesity and fatty liver, but she was only slightly overweight (I feed corn-free New Country Organics layer and they free-range, no table scraps. She was an incredibly voracious forager though). She had no signs or symptoms of anything wrong before it happened- the evening before she was as active as ever, laying and eating normally, not a hint in the world that something was wrong. I found her about ten minutes before she died the next day. Has this ever happened to anyone else? It's kind of scary, and sad.