My two year old (almost 3) Red Star died suddenly Thursday. I really don't know what happened and nothing seemed to be wrong. However, the past month or two I noticed that she wasn't acting quite like she used to; she was gentler when I hand fed her seeds, she would just stand in one place in the yard for a minute or two absolutely still, she wasn't as aggressive and dominant over my other chicken, and her attention span was much shorter than before. I also noticed that she had a bump on her leg for like 9 months - this bump did not seem to bother her, she was not in pain and was not limping or walking differently than before. I would like to know what was wrong with her and why she died so that I can try to prevent my other chicken from a sudden death.