Looks to me like the wound that got him was not from an exchange of fire as stated. However it is still possible ... that looks exactly like a 9mm handgun shot to the head. However his body guards did carry 9MM sidearms so he could have caught one during the exchange. An AK 47 would have taken his head off and the fact that there is no exit wound suggests to me a 9 mm sidearm, that and the size of the entry wound.