Former student Alvaro Castillo, 19, is arrested after murdering his father and then opening fire in the Hillsborough, N.C., school's parking lot, wounding two. He is allegedly obsessed with the Columbine shootings, and police find two pipe bombs and two rifles in the van he was driving. He later is found guilty of murder and other charges and sentenced to life without parole.
Before the shootings, Castillo sends an e-mail to the principal of Columbine High School, according to the Associated Press, that reads: "Dear Principal, in a few hours you will probably hear about a school shooting in North Carolina. I am responsible for it. I remember Columbine. It is time the world remembered it. I am sorry. Goodbye."