more here:
http://omaha.com/article/20110105/NEWS97/110109863#millard-south-shooter-dead-principal-injured
"On an update to his Facebook page, Robert wrote:
Everybody that used to know me I'm sry but Omaha changed me and (expletive) me up. and the school I attend is even worse ur gonna here about the evil (expletive) I did but that (expletive) school drove me to this. I wont u guys to remember me for who I was b4 this ik. I greatly affected the lives of the families ruined but I'm sorry. goodbye."