Childhood friends of Bryan Kohberger, who pleaded guilty Wednesday to stabbing four University of Idaho students to death in November 2022, have tracked his murder case from afar and said they felt shocked the former Pennsylvania resident suddenly agreed to a plea deal to spare his life.

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?

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.