In the bed of one of the stabbing victims, police said they also found what many regard as the case's key piece of evidence: a leather sheath for a fixed-blade knife.

University of Idaho student murder suspect Bryan Kohberger's defense is arguing that two blood samples from unidentified males at the crime scene could clear him.

Bryan Kohberger faces four counts of murder and burglary over the killings of University of Idaho students Kaylee Goncalves, Madison Mogen, both 21, and Xana Kernodle and Ethan Chapin, both 20

Prosecutors have not challenged these claims, suggesting that the evidence could play a major role in Kohberger's defense.