Robert Butler Jr., son of a police detective, shot the principal and assistant principal at his school in Omaha, Nebraska before killing himself. His last Facebook status update was a chilling indictment of the school he'd just transferred to.

According to ABC News, it read:

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.

No other students at Millard High School were injured; the assistant principal is in critical condition and the principal is in stable but serious condition.

[Image via AP]