The lead prosecutor in the University of Idaho quadrule murder case is sharing his chilling theory on why killer Bryan Kohberger spared a potential fifth victim. Earlier this month, Kohberger pleaded guilty to the murders of college students Kaylee Goncalves, Madison Mogen, Xana Kernodle and Ethan Chapin in the early hours of November 13, 2022, at an off-campus student house in Moscow, Idaho. Kohberger, 30, was handed four consecutive life sentences over the murders on July 23. He is expected to serve life in prison.