Raccoons

I think it was raccoons that killed the chickies:
"A raccoon typically attacks birds by biting the head or upper neck area. The heads of adult birds are usually bitten off and left some distance from the body. The crop and breast may be torn and chewed and the entrails eaten. Raccoons have been known to mutilate poultry in cages by pulling heads or legs off. Several kills may be made during a single night raid with part of one or more carcasses fed upon. Dead fowl may be at the kill site or dragged several yards away. Raccoons are also serious predators of wild bird populations."
http://www.geocities.com/KelliAnn293/predators.htm#Raccoons

I could not pick up Red because of the wasps, and the following morning, she was gone.

I think I will look into finding more adult hens. The next batch can just stay in the coop and never taste freedom.