What I see as a common threads among many of these things are age, isolation, social problems, no friends, and a history of emotional/mental problems. Young males not too far from his age seems to be a common thing. Maybe this boy had aspergers to some degree, but it probably was only a part of his total picture. The dynamics of his Mother and Father, an older brother who may not have had any emotional problems. They were not a poor income family if Mom is getting 240K alimony, how much did Dad make a year? Columbine, the kids were from affluent income homes, but were high school age. Last week the Portland mall shooting he was just out of high school. Some have been in College, or in their early 20's.
All the focus is on gun control, but millions of gun owners do not go on rampages. Many of those who have gone on these rampages also were obsessed with the violent video games. How far is too far in the things we entertain ourselves with, in video games and violent movies?
Time will tell more about this person, what his total profile is..
One thing for certain, Mom was know to be a very nice person--but nobody knows what went on at home. Dad and Brother both do, and there is a reason they divorced and reason brother lives with Dad. When the details of the gun storage and access to them is known, Mom's total negligence may be a huge factor. Like many gun accidents, or tragedy in the home, it many times is found loaded guns or easy access to guns and ammo as a cause. She knew he was mentally imbalanced, and should have hidden, locked up, or had trigger locks on all of them, and herself knowing where the keys were. If he had not killed her, my guess is she will have wished he did knowing her poor decisions of parenting, allowed him the access.