Four college students – Ethan Chapin, 20; Kaylee Goncalves, 21, Xana Kernodle, 20, and Madison Mogen, 21 – were found stabbed to death Sunday in their shared off-campus home near the university. The police, federal, and state agencies still have no suspects in the investigation. We will discuss what we know so far, and the possibilities of what could have happened to these University of Idaho students. Could this be the act of a serial killer?