Act 2, Scene 3 and 4

In Act 2: Scene 3, People are awaken by a drunk porter at the gates. Macduff and Lennox go to the gate and Macduff goes to Duncan’s room to wake up Duncan. When Macduff comes back he announces to everyone that King Duncan is dead. They go back to the room to investigate and Macbeth says that he killed the gaurds. Then Lady Macbeth faints to stop Macbeth from talking. Then after they investigate the murder Malcolm and Donalbain leave the country.
On hearing the terrible revelation, the Macbeths' acts are beyond suspicion, but Macbeth admits to having killed the guards of the King's chamber — not part of the original plan — and Lady Macbeth faints. The assembled thanes of Scotland resolve to avenge the act of treason. Duncan's sons, Malcolm and Donalbain, thinking themselves open to the charge of murdering their father, plan to flee to England and Ireland.
In Scene 4, the next day, the sun doesn’t rise because of the murder. Macduff then accuses Malcolm and Donalbain of killing their father. King Duncan has been taken to his burial and then Macbeth is named king. Macduff refuses to go to Macbeth’s coronation and returns to Fife. He fears that the changes that are happening are not for the better.
On his way from the castle, the Thane of Ross encounters an Old Man, who confirms the widespread reports of disruption in the natural world. Macduff appears with fresh news that Duncan is buried, that his sons have fled, and that the kingship has passed to Macbeth. The opening prophecies of the Witches have been completed.