Macbeth: Many People Were Involved In the Death of Duncan There were many people involved in the death of Duncan, the King of Scotland. However, Macbeth bears the major responsibility for the murder. Macbeth committed the task by his own hand. He understood the significance of the prediction in relation to his own ambitions. Finally, Macbeth was aware of his actions and he accepted them. Macbeth murdered Duncan. He was the one who stabbed the King and he admits that freely in the play. "I have done the deed" relates Macbeth to his Lady after he completed the objective. (II, ii, l.19) Before the murder he says