I have read a few threads that also state this issue, and have yet to find a solution. Basically, a perfectly healthy laying hen dies in the night with no symptoms other than a little lethargy in the evening prior to death. Lays an egg the day before, jumps up onto the roost at night, found the next morning in a comfy looking position on the ground, cold and stiff. Flock consists of 4 hens and a rooster, though two hens have passed away in this manner over the last 4 days. Water is changed, food is the same as always, no signs of disease or injury, perfectly normal until the evening prior to death... then a little lethargic. I'm posting this to figure out if it's a disease carried by pigeons or insects, as others in my area will also have this problem. Thanks I live in North Texas, in the Dallas area.