Was he bouncing off trees or staying on the trail? I think i would start by following the trail he was on,watch for kicked op leaves and blood.Then, if that doesnt turn up anything,call a couple buddies and walk on line real slow, look at everything a deer couldnt get into and keep close together.Overlap search patterns and kinda go in the dirrection the deer seemed to favor.If this area is well known to you,You know where they always bed,If hes headed in that dirrection,Ill bet he went there to die.I dont know why,but mine all head that way,and usually fall over on the way!