Kohberger has officially pled guilty to the murders of four University of Idaho students—nearly three years after the crimes were carried out.

With a series of “yes” replies to a judge, the Poconos 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?

Bryan Kohberger appeared expressionless as a judge asked if he murdered four Idaho college students in their off-campus home, answering “yes” to each name called out in the courtroom Wednesday.