A forensic expert said investigators in the University of Idaho murders could potentially identify the type of knife used to kill Kaylee Goncalves, Madison Mogen, Xana Kernodle and Ethan Chapin even if the weapon itself was never recovered. The expert explained that wound characteristics, including their depth, width, shape and the pattern of injuries, could give medical examiners and investigators important clues about the blade’s dimensions and design. Those findings could then be compared with known knife types, allowing authorities to narrow the weapon to a particular class or style. That was especially significant because police had publicly said they were looking for a fixed-blade knife, and a sheath found at the crime scene later became one of the central pieces of evidence in the case.
The analysis also underscored why the missing murder weapon did not necessarily cripple the investigation. Prosecutors could still build a case around forensic pathology, DNA, surveillance footage, cellphone data, witness testimony and other physical evidence even without producing the knife itself. The expert cautioned, however, that identifying a weapon type from wounds was not the same as proving that one specific knife was used, and the absence of the actual weapon would still leave room for defense challenges. In practical terms, investigators did not need to recover the knife to develop a strong theory about what kind of weapon caused the injuries, but finding it would have provided a much more direct evidentiary link.
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