You forgot the "nice", "polite", "well mannered" and "I can't BELIVE..."part...as well as might be added part to this case IF and that's BIG IF it's ever solved: "well dressed" and maybe "attractive".
This is a LONE NUT...chances are he visits elderly parents/grandparents regularly and THEY don't have a clue...and I stil believe in my heart...he has parents SOMEWHERE who truly believe he is at college and attending classes...THIS sniping stuff started at the beginning of the FALL semester...I still believe we have a "Columbine admirer" who is playing out the fantasy in a community vs a high school campus.
White college student - male - affluent family (they are paying his way through college he doesn't have to work) - rifle was given as a "gift" a few years ago - he has become comfortable firing it at a range with relatives - relatives TRULY believe he is a "responsible gun owner/user" - he is a loner at college - people in the dorm don't pay him much attention - he is extremely intelligent probably doesn't have to study as much as others - borderline genius - he looks very young for his age probably "geeky" looking- probably has been a victim of severe bullying in high school - he has an excuse for leaving the dorm to commit the crimes (lies he has a job or going to do something innocuous or fellows in the dorm don't really care) - parents/grandparents live in Richmond VA area - probably is well behaved quiet and shy in the company of adults (older family members) - he is an ardent NON smoker and NON drinker...probably raised in a very religous home...views everyone as a sinner - is a lone child NO siblings - was adopted - never developed a "bond" with his adoptive parents and these people through a religous message remind him that his REAL family abandoned him and he should be "grateful" to them - he is still a virgin.
I am sticking with this to the end...and when I am proven wrong (IF that happens) I will not beat myself up over it.