Looking Back and Moving On, Part 2

I had trimmed back an overhanging branch at the coop. We were trying to put the chickens away more promptly. But we didn't really know what to do NOW, since we couldn't identify the killer. One evening, with the boys off with friends for the weekend, Debbie and I went out for dinner and a movie. We got home after dark. The killer had struck again. Two more chickens--one DEAD, which is the normal state for being HEADLESS--and the other badly injured, and again destined to die overnight. Our egg production, once 3 dozen per week, dropped to 1 dozen. The roosters keep eating, just as much as before. The surviving hens have lost feathers. And we STILL don't know what is killing them.