Claudius runs out of the play, so Hamlet goes to kill him, but finds him praying. He didn't feel like that was a good time, so decided to wait.
Mother... I came to confront you about Claudius killing my Father. I thought he was in here so I tried to kill him. I didn't mean to kill Polonius.
Because of his act, Hamlet was sent to England.
I am sorry Ophelia killed herself. You know it was all Hamlets fault!
Claudius works with Ophelia's brother to take revenge on Hamlet and kill him. They find out he is coming back, so they poison a drink and a sword.
After Hamlet refuses the poisoned drink, the Queen drinks it and dies. Hamlet gets stabbed by the sword, but doesn't die immediately. He then stabs Claudius and forces him to drink the poison. They all three die.