Benvolio and Mercutio are running around town, when Tybalt comes over to them, and asks for Romeo.  Tybalt wants to fight him.  Benvolio and Mercutio tell him that they have no clue.  Just then, Rome walks in.  Tybalt challenges him to a sword-fight, but Romeo denies, it being that Tybalt is now his cousin by Marriage.  Mercutio stands up for Romeo, and fights with Tybalt.  Romeo gets in the way trying to stop the fight, and Tybalt kills Mercutio.
    Romeo then gets in a fight with Tybalt, and kills him.  Benvolio tells Romeo to run away, and the Prince and others arrive.  Benvolio tells everyone what happened, and Romeo is banished for killing Tybalt.