Who was murdered in mousetrap in hamlet?

In Shakespeare's play "Hamlet," the character who is murdered in a mousetrap is King Claudius. This occurs during the play-within-a-play, titled "The Murder of Gonzago," which Hamlet uses to gauge Claudius's guilt in the murder of Hamlet's father. The term "mousetrap" refers to the play's intent to catch the conscience of the king, revealing his treachery. Ultimately, Claudius's guilt becomes evident through his reaction to the performance.