BOISE, Idaho (AP) — The lead prosecutor tasked with finding justice for four University of Idaho students killed in a grisly quadruple stabbing more than two years ago laid out his key evidence Wednesday at a court hearing for Bryan Kohberger, who agreed to plead guilty earlier this week to avoid the death penalty.

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?

During a hearing at the Ada County House on Wednesday, Bryan Kohberger pleaded guilty to killing four University of Idaho students after striking a plea deal with prosecutors. The families of the victims had mixed reactions to the agreement.