That depends greatly upon your relation ship to the person in your dream. Are you angry with them? Or was it someone that you've never met? In general it has to do with repressed feelings. Not necessarily having to do with anger, and wanting to harm anyone. It could mean the end of a relationship, or the "death" of thoughts/ actions/ etc. That have been restricting your personal growth. It could also mean that you have a desire to escape from a situation. -All in all it depends GREATLY on YOUR interpretation of the dream its-self.
Nothing.....go back to sleep.
Ir you dream of killing some one it means that you used to watch horror or action films.take it in the sence that it is only a film