dmen, buy more ice. Make sure his body cavity is packed and then put a bag between his thighs. If he's really warm still, consider putting ice under him and setting some on him and maybe roll him over once to keep heat from building up between thebed and his body. Ice is cheap... use lots.

Once his body is somewhat cooled, cover him with a tarp or blanket to hold in some of the cold from the ice. (and to keep the bugs off)

If you do that he be fine.