What does it mean if you dream someone is killed?

Usually when you dream about a loved one dying your subconscious is trying to communicate a fear of that person leaving you. You aren't necessarily worried that that person will die but perhaps that they'll move away or move out of your house.

This is only one possibility the answer to your question depends a lot on the context of the dream and who the person was and what that person means to you. Sometimes that person may even be representing a part of yourself that you are afraid to lose or that you're hoping to lose.

You can get a completely free dream analysis here. You might be able to get a more accurate result if you provide more details to them. http://hubpages.com/hub/The-Most-Common-Dream-Images-Interpreted