Is there such a thing as a natural born killer?

Is there such a thing as a natural born killer?

Paper details:

8 page paper for sophomore in college. this is a sociology class.
The paper has to have 10 reliable references, cite case studies or known cases of psychopaths , be creative , taking a stance and substantiating the point of nature vs nurture in some kind of way. Facts on current neuroscience research would be great.