Terrorists acts

Abu Musa Zarkaui is dead. Us soldiers bombed house where he was hiding, than they entered ruins and found one of most wanted terrorists dying. Now their doctors have body to perform autopsy on him. That is really nice, Zarkaui wasnt nice man, but htere are some questions about whole operation. A) He was alive when found by soldiers, why died? Wasnt it all about revenge? There is possibility of killing wounded enemy which isnt nice. And also second fact is: Was dead man really terrorist, or just look similar? Propaganda is very powerfull weapon, and US already proven they are able to lie about everything.