In the play Macbeth, Lady Macbeth plays a crucial role in the death of King Duncan. She is the one who convinces Macbeth to murder the king, and she helps him plan and carry out the deed.
After Macbeth expresses his doubts and fears about killing the king, Lady Macbeth berates him for being a coward and shames him into committing the crime. She points out that he has already had the idea to kill Duncan and that he is only hesitating because of his "feeble nature." She also reminds him of his ambition to become king and tells him that he must be ruthless if he wants to achieve his goals.
Lady Macbeth's determination and manipulation eventually convince Macbeth to agree to her plan. She lays out the details of the murder, including how and when it should be done. She also tells Macbeth to leave the bloody daggers by Duncan's body so that the blame will fall on the king's guards.
After the murder is committed, Lady Macbeth is initially confident that they will be able to cover it up. However, she soon begins to show signs of guilt and madness. She becomes obsessed with the blood on her hands and cannot sleep. She also starts to have visions of the ghost of Duncan, who accuses her of murder.
Lady Macbeth's guilt eventually becomes too much for her to bear. She dies in the fourth act of the play, and her death is a turning point for Macbeth. He becomes even more ruthless and tyrannical, and he eventually loses his mind.
Lady Macbeth's role in the death of King Duncan is significant because it highlights the power of ambition and the dangers of allowing one's desires to overcome their moral principles. She is a complex and tragic character who is ultimately destroyed by her own ambition and guilt.