Do you mean you want to figure out why you had the dream? I can see that this is different to the murder witness dream in the dictionary; it's more to do with an idea of a person that you've seen on TV and heard on the radio a lot, the person must represent something to you? There must be some kind of emotional symbolism involved, like what does it mean to you that this person was killed before you were born? When did you first find out they were dead and how did you feel about that? Are there certain moods, phrases or circumstances in your everyday life that make you think about this person. For instance, I always think of John Wayne when someone mentions dieing of cancer, because he was the first person I'd ever heard of that died of cancer, before I really knew what that meant; does that make any sense?