There was a special on the discovery channel aa couple of years ago in which some students of forensic science did a murder investigation and re-enactment of how Tut's death might have occured. The chief suspects they pinpointed for having the most compelling motives were the high priest, the army commander and his wife, and they showed how each of the three might have done the deed or paid an assassin to do it. My bet was on the army commander.
The Army Commander. In the temple. With a mace.