I would have been disappointed if Dr. Amy Bishop (Harvard trained as she never stopped telling everyone), 4th from top, hadn't been included. A deranged college professor who it turns out had even killed her younger brother 20 years earlier because he was smarter and more accomplished than she in college and so he had to be punished. She was denied tenure because of her looniness and began firing during a faculty meeting she didn't have any business attending because she was going to be out the door. Killed four or five and pleaded guilty to avoid the death penalty.
http://www.dailymail.co.uk/news/article-5577833/YouTube-shooters-family-say-mustve-just-bought-gun.html
Two things actually, but you'll have to read the description to find out.