It will be interesting to hear what his psychiatric evaluation reveals. Many patients with mental illnesses, even schizophrenia, are very intelligent. Many younger people don’t show signs of a severe mental illness until their late teens or early 20’s. When a patient is psychotic, they can hear “voices” that tell them to do things (like hurt or even kill themselves or others) that they would never think of when they are not in an episode of psychosis. I’ve had patients who were very distressed to hear of things they had said or done while psychotic, and had no memory of it. It’s possible that Andrew had symptoms of mental illness but it had not been identified and treated yet. Or, he could have a history of mental illness and non-compliance with his medication. The fact that he had a cat that he apparently cared for very much, and that there are reports that he was described by a classmate as a “normal guy” make me lean towards him not exhibiting sociopathic traits. I am in no way excusing his heinous crimes, I just always look at it first as a possible mental illness, which a patient may not have full control over. My heart breaks for this poor family and the three girls left without their loving parents. No one should have to endure this. Yet I also have empathy for the mentally ill who never chose to have this terrible sickness. But, again this is my humble opinion only and I am interested to see what the situation turns out to be in this very, very sad case.