I have about 10 cats at any given point in time (I live in the country and need them to control snakes and rodents, I am not the crazy cat lady LOL) and none of them bother the chickens. I even have chicks freeranging with their mamas right now. But I know that I am lucky because I have heard so many horror stories about cats. One of my cats sleeps with the chickens at night if I don't get her out of the coop before it closes. Anyway, I am sorry to hear about your loss.