In Macbeth, who is the third murderer? Will give brainliest if given evidence to back up statement.

It can be argued both ways but I feel that the third murderer is Macbeth servant, before and after Marybeth's soliloquy in lines 45 and in between 71-72 its shows that the servant knows that banquo is attending the party and the servant knows whats happening in the palace gate. the last person whom macbeth have seen and spoken, was the servant. Also when the murder happened (scene 3 line 2) the first murderer ask who send the third murderer in the murder of banquo and the third murderer said macbeth. in addition in line 13 the third murderer said that "almost a mile;but he does usually,make it their walk."