Solved?
British Team..believes they have solved it.
"Tutankhamun: The Mystery of the Burnt Mummy."
http://www.youtube.com/watch?v=CWFLQayucds
The recent British research used car-crash simulations to show that a speeding chariot could have run into Tut while he was on his knees.
 Subsequent chemical tests confirmed that Tutankhamun's body was burnt while sealed inside his coffin. It had flamable materials (resins)