Tybalt and Mercutio are in a fight, so Romeo tries to separate them, when he does this Mercutio gets stabbed in the side and dies, then Romeo kills Tybalt.
The Prince is supposed to kill Romeo, but he says that he will just banish him from the city.
The nurse comes to Juliet's bedroom and tells her the terrible news of Tybalt being killed, and the news of Romeo being banished from the city. She is very sad and depressed and threatens to kill herself.
Romeo decides to talk with Friar Laurence, Laurence tells him that he has been banished, Romeo is also sad and threatens to stab himself. Then he decides he is going to spend a few hours with Juliet before he leaves.
Paris arrives at the Capulet's house, while they are still sad about Tybalt's death. He tell Capulet he wants to marry Juliet, Capulet fully agrees and wants the wedding to happen in three days.
Lady Capulet tells Juliet that her father is planning for her to marry Paris in three days. She is absolutely irate, however her father says that if she doesn't marry Paris, he will disown her.