Washington Post:
Gill signed his entries “Fatality666” and once called himself “Trench,” an apparent reference to the black trench coat he wore in imitation of the two teenage assailants who killed 12 students and a faculty member at Columbine High School in Colorado in 1999. He was fascinated by that attack, according to his journal, and played Super Columbine Massacre RPG, a video game that re-creates the rampage. He also raved about “Postal3,” a similar assault game, and listed a variety of other favorite games, most of them with themes of mayhem.
“Life is a video game. You’ve got to die sometime,” Gill wrote.
Here.