Bryan Kohberger has admitted guilt in the slayings of four students at the University of Idaho. But the public still doesn't know what motivated Kohberger to commit the knife attacks and how he chose his victims in 2022. More details could emerge when Kohberger returns to court for his life prison sentence on July 23. Some answers could also be in the hundreds of documents filed by prosecutors and defense lawyers that have been sealed and out of public view since his arrest more than two years ago.