When you see a killer in a dream, then such dream shows that there are certain things within you that been putted away. Perhaps you feel like you are no longer yourself. The killer in a dream could also indicate the fears of life dangers you meet every day. On the other hand, the killer in a dream shows the final stages of particular subject in your life. Perhaps you are getting over with something in your waking life.
Read more about dreaming of Killer in other dream meanings interpretations.