A new study from New Zealand have come up with an answer of what actually killed the Great Warrior. GBS. According to historians, Alexander the Great suffered fatigue and body aches then a day after abdominal pains. Symmetrical paralysis ensued and Alexander the Great became bedridden. Eight days into it, he became total paralyzed from head to toe. Unable to move and his breathing very shallow, he was declared dead and was possibly buried alive. According to historians, he remained in sound mind all the way to his death.