fox and coyote can and will climb if given enough incentive...
Well, I'm no fox or coyote, but I like chicken enough to climb for it (and I'm not that good at climbing lol).
Were you able to take care of things?
I think you said you were going to leave the dead bird out so whatever it was would leave the rest of your chickens alone, is that right?
I hope you can avoid anymore losses!!!