The other night when I went to gather eggs I found one of my RIR hens dead in the coop. I don't go in the coop in the mornings but know that she was perfectly fine the evening before. This has happened and my spotted sussex has half the feathers missing off her head. Some of the others are looking pretty haggard as well. I have unfortunately had a buff hen that decided to be a rooster and he has just figured out that he is a boy and is proceeding to show everyone he is. Needless to say several of my hens don't like it and proceed to peck him and chase him off. Is it possible that he is upsetting my hens and this has caused all the turmoil in the coop?