it's just a theory, nothing for sure at the moment. I can shortly tell you about this theory...Some archaeologists believe that the bone piece that lay at bottom of Tut's skull (the only thing they have in their hands is a very old xray film, nothing else) is due to a hit in his head, probably while sleeping....then they started to try to figure out how it could happened and who could have had prior interest in Tut's early death. According to this line of thoughts, the one should be Ay. Ay was the high priest of Amon before the heresy of AkhenAton....he's been always very able to mantain his power. Once AkhenAton died he tried (Tut was very young and Ay was actually governing) to restore the ancient Gods, and so obviously also the other priests (I'm trying to shorten a little bit).....The only thing that we know for sure is that, after Tut's death, Ay became King, even if only for few years, and that in Tut's tomb he is represented while doing the "opening mouth" ceremony, meaning that he was Tut's director succeder. There has also be found a letter, wrote by Tut's wife AnkhesenAmon, sent to the Ittita King, asking for one of his sons to come in Egypt to marry her and become the king, that she didn't want to marry one of her servants!
There are no news about what happened to AnkhesenAmon...for sure she died! ahahahah....It is possible that if Tut's was killed this way, she had the same end, but.....THERE IS NO PROVE OF THIS!
Another news about Ay...some archaeologyst believe he was the father of Nefertiti....still not prove...eheheh
Just to add few more lines, you'll read some tread about that in this community. Some important tests are being made on many mummies that lay in Egypt. This because they have to restore them and also see if they can find some important news about historical periods, illness and so on...The first mummy will be Tut's one....no dna test is scheduled on any mummy...so will see if they'll find something interesting...
I hope I was clear enough....
so, ciao ciao