Polonius also had a son named Laertes. While Prince Hamlet was burying Ophelia in the tomb, Laertes appears. Laertes blames Prince Hamlet for the deaths of his father and sister. He claims to love Ophelia more than Prince Hamlet. He challenges Prince Hamlet to a fight with a poisoned sword. Claudio was behind all the poisoning. She poisoned Gertrude by accident by trying to kill Prince Hamlet. Ultimately, Prince Hamlet and Laertes kill each other. Before dying, Prince Hamlet kills King Claudius. The throne was now open for Prince Fortinbras to take