There are many speculations about who is the third murderer of Macbeth and will kill Banquo's third murderer. Macbeth, Mrs. Macbeth, and one of the strangest sisters are the best candidates to fulfill this role. Each of these three protagonists has their own motives and why they want to join the assassination. There are reasons to explain why among three possibilities to fulfill the role of this third murderer, why they can not fill that position.
Looking at all the evidence, Macbeth seems to be the only candidate who could become the third murderer. Mrs Macbeth did not even know about the plan When she asked Macbeth it was obvious, "What are you planning to do?" (February 3, 45). Of course, Macbeth did not share the murder plan with her, so she did not know the details about what is going on. Macbeth did not believe that Lennox was enough to involve him into the murder conspiracy as he seemed to suspect Macbeth after Duncan was killed. His condition was ironic and sarcastic when he reported the apparent guilt of the groom as "It seems not to be the case" (2.3.97). Furthermore, at the murder scene, the identity of the third murderer is very important for servants or anyone else.
It is foolish to argue that the third murderer who appeared in this scene is Macbeth himself. If Shakespeare implies this, we can be convinced that he will give hints to the audience. In the next scene, Macbeth 's speech to the first killer finally showed he did not know anything about the details of the Banquo attack, and if he was one of the murderers this would not be the case . You may be able to make the third murderer a "perfect spy" of iii. I. Macbeth sent 130 at the last minute as an ambush reexecution
The third murderer joined the other two murderers waiting for the arrival of Banquo and Fleance. The first murderer asked the third murderer who sent him, and the third murderer answered Macbeth. The third murderer heard the horse approaching. Banquo and Fleance descended a mile outside the palace's gait and started taking the torch to the palace. The second murderer saw the light of the torch; three murderers attacked and killed Banquo. In line 20, before Banquo 's death, he shouted to his son: "Fly, good flowers, fly, fly, fly!" (III. Fleance ran away, but Banquo was killed, and the murderer carried Banquo corpses to the palace.