A childhood friend of Bryan Kohberger’s was disgusted to find out he was capable of carrying out a quadruple homicide — and she wonders if he ever thought about killing her.

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?