Male DNA left on a knife sheath was used to link a then-doctoral student in Washington state with the slayings of four University of Idaho students in November — and a surviving roommate came basically face-to-face with him the night of the killings, according to court documents unsealed Thursday. A probable cause affidavit prepared by Moscow, Idaho, police Officer Brett Payne lays out how investigators used video surveillance in the area to connect the quadruple homicide with a white Hyundai Elantra driven by Bryan Kohberger, 28. He is being held without bail at this time..