According to court documents obtained by E! News, an Idaho grand jury determined the 28-year-old “did unlawfully enter a residence” in the town of Moscow last November and “wilfully, unlawfully, deliberately, with premeditation and with malice aforethought, kill and murder” Maddie Mogen, 21, Kaylee Goncalves, 21, Xana Kernodle, 20, and Ethan Chapin, 20.