It's really good so far. For further chapters, I strongly recommend that you research psychosis. It's really interesting stuff. That way too, you can capture the psychotic guy's thoughts perfectly. Psychotic people can think of some really weird stuff, like that people are out to get them, or someone told them to kill someone else... like a voice in their head. Other really interesting things of psychosis could be that the psychotic guy thinks that the tv and radio are sending him messages... that could be something interesting to include :)