I'd have to bet that he was probably wounded either on that property or adjoining property and died there. Sometimes they can go quite a ways after taking a bullet through the gut or somewhere similar.
You may be correct; there's a county road which runs through a potion of our 2k acres and there's been a few instances of poaching over the years, albeit nothing like one would expect in east Texas. I don't believe it was any of our hunters - not many hunt in that area and there were no reports of a lost buck. Of course he could have also been hit on that county road and had enough strength to make it to where I found him, which was within 100 yards of said road. My money is still on the yotes. I found a doe and fawn dead nearby as well, in approximately the same state of decomposition.
I cleaned him up and scored him yesterday - ended up just shy of 130.