What to do?

Kimberly Dunne and I are going to produce a horror/thriller beginning to a film. Our initial idea is to tell the story of an 11 year old child who kills as a result of past abuse. I have used the Internet to research stories of young children who have murdered other people in the past. I came across this quote written by Mike Rustigan on the site http://www.karisable.com/crserial.htm

"With all of them, their motives tend to be total, deep and personal. They feel no guilt, no remorse and have an attitude of total disdain towards their victims."

The great sense that they feel no guilt is what I want to capture in the 11 year old child. The great remorse of something that happened when they were a younger child is what I want the viewer to understand. Overall the reason the child in the film murders is something very personal and deep that is related to their own upbringing.