He was almost 8 years old and was a healthy thriving bird for many years. He appeared listless last week the morning after a terrible storm, was gaping and almost seemed to drool. Because he was not in this state constantly I wasn't immediately thinking the worst -- I thought for sure he had some kind of upper respiratory issue as he also stopped crowing. We treated him with colloidal silver and within a few days he seemed to bounce back. We were thrilled. We continued with the colloidal silver -- and yesterday discovered he also had some mites inside his wing feathers. We gave him a dust bath and believed he'd continue to improve. Today we decided to give them all water baths, get rid of our old coops and move the runs (all metal fencing) elsewhere. Started feeling paranoid about mites but with all the photos I've seen and experiences others have shared did not think it would mean the end of the road for him. Then I just read earlier about mites killing chickens within a few days. I am heartbroken and feel like the extended coop stripping out allowed mites to breed and attack him whereas previously we NEVER had this problem. I don't know if he had a secondary issue because of the mites or was targeted because he had an underlying issue. The hen he was with has some leg mite issues which we are treating but she has nothing on her body. Nor does our other hen who was fenced adjacent to them. Last night he wasn't looking well and this morning after bath time and some drying I applied some topical oil of oregano - I know it's strong but I thought a few drops wouldn't hurt and would help get rid of these **** mites. He laid down after his bath -- and took his last breath within the next couple of hours. I feel terrible, for how he must have suffered. It sucks to find your chicken sick and feel so helpless to help them. Has anyone else lost a chicken to mites? Could having some mites have brought on another infection because he was weakened? I just kick myself for not noticing symptoms sooner. And going forward I will do more than DE and have a wood ash bath area for all of them. Missing his crow so much, he was the sweetest rooster!