I lost two cinnamon queens. I do not know about the one, but the other tried to find shelter under a proped up board. It got very cold that night and I found her dead.
I lost 1 or 2 others, but I do not think it was due to the cold. I think they just got old.
I lost two, a NICE silver laced polish roo and a silkie roo to a fox, i think. I miss that polish. I thought it got a leghorn, but she showed up with no tail feathers the next day. I lost a big cochin hen that day. I think she was run to death, but the predator just left her. I guess if they fall over dead they will not take them ?
Other than that, I have been extremely lucky. I am religous on putting up the birds at night. I will put their safety over just about anything else I do. They depend on us to keep them safe, fed, watered and able to see the light of day. If one is going to have an animal they need to take care of them. However, sometimes you mess up or the animal just dies. One is only human.