here at millard in november. his name is robert butler jr., he was a transfer student from lincoln. >> fool themselves sometimes, he wasn't quiet or anything, just very arrogant. >> reporter: robert butler jr., a high school senior with a close connection to omaha police. >> the omaha police department as the suspect's father is an omaha police detective. >> reporter: his father, robert butler, on the force for seven years. the 17-year-old posted a disturbing status using many expletives on his facebook page before he opened fire, saying, "everybody that used to know me, i'm sorry, but omaha changed me and f'd me up and the school i now attend is even worse. you're gonna hear about all the evil blank i did, but that fing school drove me to this i want you guys to remember me for who i was before this. i know i greatly affected the lives of the families i ruined, but i'm sorry.