4 hens missing feathers on belly, leghorns, approx. 3 years old. of the 4 one has died in less than 48 hours of turning lethargic.

[shedin]

Of the three remaining they are still very active. No signs of lice or mites. No eggs bound. Chickens are free range with layer pellets available. Fresh water every day. What is happening?

 

[Emelyn]

Of the three remaining they are still very active. No signs of lice or mites. No eggs bound. Chickens are free range with layer pellets available. Fresh water every day. What is happening?

Try and do a deep clean of your coop just in case that there may be mites that are hiding. Otherwise @21hens-incharge @Miss Lydia or @HappyClucker7 might know.