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.

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 admitted to the killings of four University of Idaho students at his change of plea hearing on Wednesday, pleading guilty to all five counts, despite the former criminology student's initial eagerness to be exonerated in the high-profile case.