A pillow with a «reddish/brown stain.» A «collection of dark red spots». A disposable glove. At least a dozen strands of hair.

Those are just some of the items investigators seized from the apartment of Bryan Kohberger, 28, the former doctoral student accused of killing four University of Idaho students, according to a search warrant issued Wednesday.

The warrant was served on December 30, the day Kohberger was arrested at his family’s home in Pennsylvania.

More on the murders of Idaho college students

Included in the items taken from Kohberger’s Pullman, Wash., apartment, according to the court order, were a stained mattress cover, a computer tower, several receipts, the dust container from a «Bissell Power Force» vacuum cleaner, a stick of FireTV. with a cord and plug and what is described as a «possible clump of animal hair.»

The other hair samples are not specifically identified as human in the warrant, signed by Washington State University Assistant Police Chief Dawn Daniels. The document also does not divulge if any have been tested.

Investigators have said the person who killed the four students was likely to have been splattered with blood after the Nov. 13 massacre in the small college town of Moscow, Idaho.

Four days after Ethan Chapin, 20; Madison Mogen, 21; Xana Kernodle, 20; and Kaylee Goncalves, 21, were found murdered, Latah County Coroner Cathy Mabbutt said they were likely attacked with a large knife and died from multiple stab wounds.

Police also searched Kohberger’s office at WSU, where he had been working on a Ph.D. in criminal justice and was a teaching assistant, but he did not seize anything, the documents reveal.

The quadruple murder shocked the country and locked down police for seven weeks before Kohberger was arrested.

He has yet to enter a guilty plea. All four counts of first-degree murder carry sentences that could include life in prison up to the death penalty.

The document describing the physical evidence seized from Kohberger’s apartment came in the wake of revelations that police had used male DNA on a leather knife sheath found at the crime scene, and compared it to samples found in trash. from the suspect’s family home in Pennsylvania. link him to the murders.

Police have not found what they believe to be the murder weapon. They have not revealed a possible motive either.

Kohberger is expected to face a preliminary hearing in June.