The gunman who wounded six people at a FedEx facility in Atlanta before killing himself complained in a note of depression and sexual problems.
The 19-year-old assailant, Geddy Kramer, did not give a direct explanation of why he targeted co-workers on April 29, armed with a shotgun and homemade explosives.
In the note obtained by The Atlanta Journal-Constitution, Kramer wrote that his attack was the result of a "several month snap." He called himself a sociopath who wanted to hurt people. He also wrote that he was sexually frustrated.
He said that being infamous was better than being "just another nobody."
Investigators have said they may never know what specifically prompted the violence.