I cannot think of anything that would disprove that theory. However, something that may help you would be to look through our past posts throughout teh site and you will probably find lots of theorys as to what may have happened to him accident-wise by many different people. There may even be a theory that would disprove one about an accident. I'm not sure, unfortunately I don't remember everything
P.S. You may want to try using search on this site, where you can search posts made by board members. I know you'll find a LOT of information about Tutankhamen there.