Macbeth is having doubts about killing King Duncan and feels he doesn't have a reason to. When he tells Lady Macbeth how he feels, she calls him a coward and says, "“When you durst do it,” she says, “then you were a man” (1.7.49)" To try and convince him to kill Duncan, she tells him her plan to make it easier.
Banquo and Fleance are walking late in the hallway talking about Banquo's problems sleeping. They meet Macbeth walking through the hall and Banquo updates him on the king being asleep. As Banquo and Fleance exit the hallway, Banquo sees a floating dagger with the blade pointing towards King Duncan's room. As he is trying to figure out what he should do, Lady Macbeth sounds her signal for the sleeping chamberlains.
Macbeth has killed the king and is very distraught about it. He says that the chamberlains woke up and said their prayers and when he tried saying "amen" it wouldn't come out. Lady Macbeth comforts him until she sees that he still has the dagger in his hand. However, since Macbeth was so shaken up he wouldn't go back and leave the dagger. Lady Macbeth does the dded herself and then takes Macbeth to clean the blood off of his hands.
Macduff (in the grayish blue) has came to the castle to meet with King Duncan. He walks in the room to find him dead and calls for everyone else. Duncan's sons (the red heads) feel whoever killed their father will eventually come after them too so they flee. Lady Macbeth enter looking surprised that something like this could happen in her castle and faints. Macbeth says that he has killed the chamberlains due to his range over Duncan's death. Macduff become suspicious of all these murders that are happening.
Ross and an old man walk outside to talk about all the strange events that have taken place recently. Macduff comes outside to inform them that Macbeth has been named king and is on his way to be crowned.
Macbeth has now been crowned king and has invited Banquo to a feast at his castle. Macbeth begins to think and feels that someone will soon be after him since the witches said Banquo's children will sit on the throne. He hires two men who have been done wrong by Banquo to kill Banquo and his son Fleance.