How did Macbeth kill Duncan in Shakespeare's Macbeth?

In Shakespeare's Macbeth, Macbeth stabs King Duncan to death in his sleep using a dagger and places the blame on his chamberlains.

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Having at long last plucked up the courage—if that's the right word—to kill Duncan, Macbeth finally does so by brutally stabbing him to death in his bed.

Lulled into a false sense of security by the generous welcome accorded to him by Macbeth and his wife when he arrived at their castle, Duncan never saw it coming. Macbeth was always such a loyal and faithful nobleman who'd given such devoted service to his king and to his country. The idea that he would've turned into an assassin would never have crossed Duncan's mind in a million years.

Now that Macbeth's finally done the dirty deed, it's time for a cover-up so that no one will suspect that he's the murderer. However, Macbeth is much too shocked to do what he's supposed to and return to Duncan's chamber and smear the blood on his servants to make it look like they were the ones responsible for this heinous crime. So Lady Macbeth has to do it for him.

Then it's time for a little coaching. Lady Macbeth instructs her husband in how he should act when Duncan's death is discovered. He needs to appear shocked when the sordid crime is revealed. This way, it is hoped, no one will suspect him of being the murderer.

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After receiving the favorable prediction from the Three Witches that he is destined to become the future King of Scotland, Macbeth informs his cruel wife of the prophecy, and she begins plotting King Duncan's murder. Initially, Macbeth is reluctant to follow through with his wife's bloody scheme, but he finally succumbs to his ambition. At the end of act 2, scene 1, Macbeth hallucinates and sees the vision of a bloody dagger leading him to Duncan's chamber as he prepares to kill the king.

Macbeth murders King Duncan offstage in act 2, scene 2. According to Lady Macbeth's plan, she drugs Duncan's servants and leaves their daggers out for her husband. Macbeth then uses the daggers to murder King Duncan in his sleep and before he also kills the unconscious servants. The original plan was for Macbeth to leave the daggers behind in the king's chamber and smear the blood on the servants, which would make it seem like they killed the king. However, Macbeth is too shocked and guilty to carry out the remainder of the plan.

Lady Macbeth scolds her husband for acting like a scared coward and removing the daggers from the chamber. After Macbeth assassinates the king, he is too disturbed to reenter King Duncan's chamber, and his wife is forced to place the bloody daggers back in their proper place. Lady Macbeth tells her husband that he is "Infirm of purpose!" and says, "My hands are of your color, but I shame / To wear a heart so white." Lady Macbeth then brings the daggers back into the king's chamber and coaches Macbeth to act surprised about the crime.

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In act 2, scene 2, Macbeth enters King Duncan's chamber while he is peacefully sleeping and stabs him to death using a dagger. In addition to assassinating King Duncan, Macbeth also slaughters the chamberlains inside Duncan's room in an attempt to frame them for the murder. Before entering Duncan's chamber, Lady Macbeth successfully drugged the king's chamberlains, who were fast asleep by the time Macbeth arrived. Shakespeare does not depict King Duncan's murder, which takes place offstage, and Macbeth enters the scene in a state of shock with blood on his hands. Macbeth is visibly shaken following the murder and begins to experience auditory hallucinations. Macbeth instantly regrets his actions and tells his wife that he could not say "Amen."

Despite her husband's reaction, Lady Macbeth remains composed and resolute. When Macbeth refuses to place the bloody dagger back inside Duncan's chamber, Lady Macbeth takes it upon herself to carry out the task and frame the deceased chamberlains. She also tries her best to calm Macbeth's spirits and encourages him to suppress his erratic emotions in order to deceive the Scottish nobles. When Macduff and the other Scottish nobles arrive to wake King Duncan, they are shocked to discover that he was brutally murdered in his sleep. Macbeth and his wife pretend to be appalled by the assassination, and Lady Macbeth faints to avoid suspicion. Overall, Macbeth murders King Duncan in his sleep using a dagger and blames the murder on his chamberlains.

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Macbeth murders Duncan in his sleep with a dagger in Act II Scene II. He intends to frame the chamberlains for the murder, but is so distraught after the killing that he forgets to leave the dagger behind. Lady Macbeth orchestrates the actual framing of the chamberlains by placing the bloody daggers beside them as they sleep. In Act II Scene III, Macbeth then kills the chamberlains "in a rage" the next morning when he comes upon them in "surprise" with Macduff--this evokes suspicion in the latter, as it is a seemingly vicious overreaction, one which Macbeth tries to support with the claim of being so completely outraged that he could not restrain himself.

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