Lady Macbeth wants Macbeth to kill king duncan because she wants to be queen. King duncan has a lot of trust with macbeth so no one will suspect it. And she also persuades him by saying he can be king, and have all this power.
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The king
killing king duncan (:
Lady Macbeth planned to blame the murder on the grooms of Duncan's chamber. This frame-up was successful, at least at first.
Duncan is his cousin. Duncan is his king. Duncan is his guest. If he murders Duncan, he invites others to murder him. Many people like Duncan for being a nice guy and will be angry when he is killed.
She was haunted by the experince of killing King Duncan, and commited suicide.