Many questions remain after Bryan Kohberger decided to plead guilty to the murders of Kaylee Goncalves, Madison Mogen, Xana Kernodle and Ethan Chapin.

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?

Here’s what to know about the case and the recent developments. What has happened so far in the case? What do we know about the plea deal?