The DNA of the man accused of killing four University of Idaho students was found on a knife sheath at the crime scene, an investigator said in court documents unsealed Thursday.

The affidavit written by Moscow, Idaho Police Cpl. Brett Payne was made public just minutes before a court hearing began for the man accused in the Nov. 13 deaths, 28-year-old Bryan Kohberger. Kohberger arrived in Idaho late Wednesday on a law enforcement jet and was handed over to local authorities after his arrest in the case last week in Pennsylvania.

He is charged with four counts of first-degree murder and felony burglary in the closely watched case that has grabbed the nation's attention and rocked the small college town on the Idaho-Washington border.

His attorney in Pennsylvania, where his parents live and where he was arrested, has said he is eager to be exonerated.

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