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Idaho State Police have released images of the Ka-Bar knife sheath that Bryan Kohberger left behind at the University of Idaho crime scene, a key piece of evidence that helped authorities arrest him as part of a massive investigation into the quadruple homicide of four undergrad students in an off-campus home.

The photos were included in a public records release of more than 2,300 pages produced by state investigators .

Other evidence released includes handwritten notes from investigators, photos of nail clippings from the victims that were tested for DNA evidence and samples from Kohberger's Hyundai Elantra that were tested at the crime lab.

BRYAN KOHBERGER'S PROFESSOR CALLED OUT HIS ‘ASSUMPTION’ ABOUT LOCAL COPS BEF

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