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people die of stabbing, they are Mercutio, Tybalt, Paris and Juliet. Romeo dies of poisoning.
No single person is directly responsible, but I think that Mercutio, Nurse and Tybalt should be punished. However, Mercutio and Tybalt are dead, also if fate was a person he would be punished. There are some factors, which go together, and can not be pinpointed on anyone in particular, so everyone in the play is to blame for the tragedy.