Nearly two months after the murder of four students in Idaho, we now know why the police arrested Bryan Kohberger: his DNA was found on the sheath of a knife at the scene of the crime.

For the rest, the publication on Thursday of the "affidavit" justifying his arrest leaves many gray areas hovering over a case that has stunned America.

Kaylee Goncalves, Madison Mogen, 21, Xana Kernodle and Ethan Chapin – 20 and a couple – were stabbed to death in their student residence while they were asleep on November 13.

The murder weapon remains untraceable, but a knife sheath was left on the bed of one of the victims.

A DNA trace could be analyzed and corresponds to that taken from waste at the home of Kohberger, Pennsylvania.

Bryan Kohberger had turned off his phone the night of the quadruple murder, but phone records show he had been in the neighborhood a dozen times over the previous weeks.

And according to CCTV footage, his car, a white Hyundai Elantra, was near the student house between 3:29 a.m. and 4:20 a.m.


One of the survivors face to face with the murderer

Two other students in the residence were not attacked.

One of them, DM, told investigators she heard a noise.

And thought he heard one of the victims say "there is someone (in the house)".

When she opens the door to her room for the third time, she finds herself face to face with the killer, dressed in black and masked, seeing only “his eyebrows in battle”.

She remained "petrified, in shock", then saw the suspect exit through a sliding patio door.

The young girl then locks herself in her room, around 4:17 am.

For some reason not explained in the document, it was not until 11:58 a.m. that she called the police.

Bryan Kohberger, 28, is a doctoral student in criminology who was studying at a nearby university.

After the murder, he ordered new license plates, then drove across the country with his father to spend the holidays at the family home in Pennsylvania, where he was arrested on December 30.

For the moment, he refused to answer the questions of the investigators.

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