Investigators are now exploring the possibility that more than one killer is responsible for the murders of four University of Idaho students, as police are on the hunt for a military-style knife believed to have been used in the brutal stabbings.
Ethan Chapin, 20, Madison Mogen, 21, Xana Kernodle, 20, and Kaylee Goncalves, 21, were all found dead in an off-campus home in Moscow, Idaho, on Sunday.
