I wonder how much his adult personality differs from his adolescent personality? I've started to become very aware of a shift in people as they move from adolescence into young adulthood. If there was a tendency toward some instability or dysfunction, it often shows up in early-adulthood. Also, even if his parents are stable and wonderful, mental or emotional dysfunction can skip a generation. When families are around long enough, people will often say, "You are just like your..." Fill in the blank, uncle, aunt, grandfather, grandfather's brother/sister... I'm wondering if a map of the family tree would show generational patterning relevant to this very public and very tragic event. But to do that it would require the family to participate, and it would have to be for a university study or other accepted venue. Now that families are much more transient, this kind of information internal to the family is not so often available.