Some of the biggest questions about the University of Idaho murders have never been fully answered. But now that Bryan Kohberger pleaded guilty and has been sentenced, at least the prosecution can speak out - and give their theories, based on more info than anyone else has had. One question? Why didn't Kohberger kill everyone in the house? But more precisely, why didn't he kill Dylan Mortensen? OK, so based on the evidence, it seems Kohberger entered the house shortly after 4 a.m. and went straight upstairs to Maddie Mogen's room.