I'm sorry, but it took 25 minutes for cops to respond to a double murder?
What the [censored]?
Seriously.
This kid clearly has a severe mental illness. We may never know whether there were signs before this tragedy or not.
Also, this 911 operator is one of the greatest human beings I've heard in a while. She's talking on the phone with someone who just murdered his mother and sister, but she still manages to keep her cool and stay in control of the situation. You can tell by the tone of her voice that she actually cares. It's just a shame that he didn't get help before he decided to commit this horrible act.
I'm going to go with hyrule one this one, most likely an undiagnosed disorder. Maybe Reneer, if he stumbles on this thread, will have a good guesstimate as to what disorder would have caused him to act in such a fashion.
I'm not a psychologist, but it sounds like Schizophrenia to me.
...characterized by a breakdown of thought processes and by poor emotional responsiveness.
The onset of symptoms typically occurs in young advlthood...