Hebona.
Hamlet dies in Act 5, scene 2 when he is struck by Laertes with a poisoned sword. He and Laertes are dueling and Laertes is using a blade that Hamlet's Uncle Claudius has tainted with a strong poison.
His brother, Claudius, came out into the garden while King Hamlet was sleeping and poured poison into his ear.
Hamlet stabs him after Queen Gertrude dies from drinking the poision that was meant for Hamlet.
According to the report that the Ghost gives Prince Hamlet, Claudius, the king's brother, poured poison in his brother's ear as the king was sleeping in his garden, and then spread the word that King Hamlet was bitten by a snake.
when hamlet saw his father's ghost, the ghost said that hamlet's uncle (which he was king during that time) put poison in hamlet's father's ear while he was sleeping so he could become king. so it was hamlet's uncle
Hamlet stabs Claudius with a poisoned sword, but only the tip is poisonous and it is dubious whether Laertes' poisoned tip cuts the king as King Claudius cries out for help claiming he is only hurt. Hamlet then holds him down and forces him to drink the last of the poisoned wine that had been intended for Hamlet, but his mother, the queen, drank it and died. Laertes says the king "is justly served; It is a poison temper'd by himself. [the king]" Implying Laertes' poison didn't kill Claudius, Claudius's poison killed himself, just as Laertes was slain by his own posion from the sword. So, Hamlet kills Claudius by making him drink a cup of poisoned wine that Claudius had intended for Hamlet.
Claudius hopes that Hamlet will be killed in England. Claudius is the King and is also the brother of Hamlet.
The uncle poured poison down his father's ear. Hamlet suspects that Claudius, his uncle, is a murderer in that he suspects that Claudius killed Hamlet's father, Claudius's brother, in order to become King. When the Ghost reveals to Hamlet that he was killed by Claudius, Hamlet's immediate reaction is, "O my prophetic soul! My uncle?"--which is a pretty clear indication that Hamlet had some serious suspicions beforehand.
The ghost says that he is stuck in purgatory because he did not have a chance to confess before he died. It would have been less cruel to have killed him as he stepped out of the confessional, but give Claudius some credit here--he's not going to kill Hamlet in such a way that Claudius was going to get caught. Claudius might have chosen a less nasty poison, one supposes. That would have been less cruel.
King Hamlet, in Shakespeare's play, was poisoned by his brother Claudius.
Hamlets Father
Fortinbras Senior.