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.
Forensic technicians tested the sheath for DNA evidence, ultimately recovering a sample on the snap.
The sample later turned into a tip developed by investigative genetic genealogists and ultimately led police to Kohberger’s parents’ home in Albrightsville, Pennsylvania, where he was arrested on Dec. 30, 2022.
He pleaded guilty in July and was sentenced to four consecutive prison terms of life without parole, plus another 10 years, for the murders of Madison Mogen, 21, Kaylee Goncalves, 21, Xana Kernodle, 20, and Ethan Chapin, 20.
The sheath of the Ka-Bar knife used by Bryan Kohberger in the murders of four University of Idaho students at their house in 2022.Idaho State Police
The sheath was part of a release of over 2,3000 pages of evidence from the case by Idaho state investigators.Idaho State Police
A photo of gloves taken from Kohberger’s parents’ house in Pennsylvania by investigators.Idaho State Police
Kohberger at his sentencing hearing in Ada County Courthouse in Boise on July 23, 2025 after pleading guilty to the murders.Photo by Kyle Green-Pool/Getty Images
Madison Mogen, 21, top left, Kaylee Goncalves, 21, bottom left, Ethan Chapin, 20, center, and Xana Kernodle, 20, right.
According to the investigators’ notes, the victims left a sliding door open on the night of the attack for Goncalves’ dog, who was found unharmed in her bed. Goncalves and Mogen were both killed in Mogen’s bedroom.
Many of the records had to do with crime lab work, including DNA testing, fingerprint analysis and other measures early in the investigation.
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