Mystery man spotted with slain Idaho students before killing

Newly surfaced video shows a mystery man with two University of Idaho students hours before they and two others were brutally slaughtered in a scene cops called the “worst they’ve ever seen.”

WATCH: Video shows two of four slain University of Idaho students

Timeline of the University of Idaho quadruple murder

Timeline of the University of Idaho quadruple murder

Mystery man spotted with Idaho murder victims ID'd

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Idaho Eyewitness: Murdered Students 'Ditched' Guy at Food Truck

Idaho victim's dad says mystery man in surveillance footage not a