My red sex link(a Golden Comet from a hatchery) died today. She was almost six months old. She was top of the pecking order and very quick and active. She started laying on November 13 and laid an egg a day for just five days, then stopped and never laid again. Her comb faded and shriveled up. Over the past two weeks she gradually became withdrawn, quiet and slow moving. Yesterday she stopped eating and drinking and stayed inside the coop all day. This afternoon she laid down in the coop and had trouble opening her eyes so I brought her inside and tried to help her with a warm bath and then a heating pad, but it was too late. She died in my arms. I am a first-time chicken owner. I have four other pullets the same age who seem healthy. Two have started laying. Any ideas on what could have happened to my Little Red? I am afraid it is contagious and the others could die too. She wasn't sneezing or wheezing, didn't have a drippy nose or eyes. She had diarrhea today and maybe yesterday but before that her droppings seemed normal. We got our first snow yesterday and last night was very cold. The coop is unheated. It didn't seem to bother the others though. Could she have been egg bound? I am so sad and would like to know what happened.