I have shot deer at sunset more than once and usually will wait until morning to find them. Once when this happened I watched the deer go over the hill knowing he was hit good but when I climbed down out of my stand it was too-dark to trail the deer. I picked up the blood trail at first light the next morning and found the deer shortly there after but the coyotes had beat me to it and had pretty much devoured one of the hind quarters.
Eyehunter