Idaho State Police have released more than 500 pages of documents compiled during their investigation of the University of Idaho student murders and into killer Bryan Kohberger.

They include dozens of witness interviews, photographs and other evidence obtained before and after Kohberger’s arrest – from the start of the investigation when they had few leads to the end, after Kohberger was already in custody and police had DNA linking him to the scene.

Some of the interviews shed new light on the victims as well as Kohberger’s mindset before the slayings.

A fellow graduate student at Washington State University, where Kohberger was pursuing a Ph.D. in criminology, told state detectives that Kohberger butted heads with classmates and faculty.

A watchman parked outside 1122 King Road on Dec. 11, 2022, four weeks after four students were stabbed to death inside.  (Michael Ruiz/Fox News Digital)

At another point, someone broke into Goncalves’ parked car, moved some of her personal belongings, including lip gloss, placed her suitcase in the street and stole her underwear.

The other victims were Madison Mogen, 21, Xana Kernodle, 20, and Ethan Chapin, 20.

Next to Mogen’s left hip, police found what would turn out to be a crucial part of the case – a tan leather Ka-Bar knife sheath with Kohberger’s DNA on the snap, left behind on the victim’s tan comforter in her third-story bedroom.

Kohberger ultimately pleaded guilty to four counts of first-degree murder and another of felony burglary weeks before he would have gone to trial. The plea deal avoided the death penalty, and Kohberger received four consecutive sentences of life with no parole plus another 10 years. He waived his rights to appeal and to seek a sentence reduction.

This is a developing story. Stick with Fox News Digital for updates.