With a series of “yes” replies to a judge, a man accused of killing four Idaho college students pleaded guilty in exchange for life in prison and no death penalty. But left untold so far: What motivated Bryan Kohberger to commit the middle-of-the-night knife attacks and why those victims?

After a surprise plea deal agreement, Bryan Kohberger appeared in court on Tuesday and admitted to killing four University of Idaho students: Madison Mogen, Kaylee Goncalves, Xana Kernodle and Ethan Chapin.