A new court filing reveals the defense team for Idaho college quadruple murder suspect Bryan Kohberger is planning to argue at trial that the knife sheath found at the crime scene was potentially planted by the real killer. 

In the state’s filing released on Tuesday, prosecutors summarized a defense filing that appears to be sealed.

“Instead of challenging the conclusion that the DNA on the knife sheath belonged to Defendant, the defense’s expert disclosures reveal that the defense plans to argue the DNA on the knife sheath does not prove Defendant was ever at the crime scene and the knife sheath itself could have been planted by the real perpetrator,” the filing reads.

Idaho investigators found a three-person mixture of DNA under 21-year-old University of Idaho undergrad Madison Mogen’s fingernails after she and three friends were killed in her off-campus rental home in Moscow, Idaho, on Nov. 13, 2022, according to previous court filings.

The FBI declined to comment and instead pointed to Ada County Judge Steven Hippler’s Feb. 17 order, which found investigators had not violated Kohberger’s constitutional rights with the IGG searches.

Kohberger’s trial is scheduled to begin on Aug. 11, and he could face the death penalty if convicted. 

Fox News Digital reached out to Kohberger’s attorney for comment.

Stepheny Price is a writer for Fox News Digital and Fox Business. She covers topics including missing persons, homicides, national crime cases, illegal immigration, and more. Story tips and ideas can be sent to stepheny.price@fox.com