The killer not dying means that the growth of this new part of yourself hasn't removed the problem. The question is, what does this monster relate to in yourself. It's violent, so there is a communication barrier and some sort of being at odds. And it's within you. You can't run from it forever, though. As Carl Jung would say - the idea is to find what lies at the heart of the monster, and embrace it. Only by embracing oru dark side can we mend our emotional wounds.