DH had let them out into the run this morning, I think she must have already been dead, but he was in a rush, so he hadn't watched them come out, just opened the house door. I went to open the run to let them into the garden earlier and she was lying dead in a nest box. Eyes closed. She was a 7 year old bantam and I just adored her. She looked fine yesterday, but now I'm worried that I may have missed something. She had got a bit thin, but she's been her normal perky self. She found hot weather hard as she had lung damage from infections, so i am concerned that she may have got squashed into the box by hen 2. Is it common for hens to just die suddenly?