A woman who lived in the same house where four University of Idaho students were murdered says she saw a masked man in black clothing walking towards her, according to an investigator.

The unidentified housemate said she awoke to the sound of crying and opened her second-floor door around 4am and stood in “frozen shock” as the man walked past her towards a back door, court documents showed.

After seeing the male, she locked herself in her room.

The housemate, who was not harmed in the attack, described the male as 5ft 10in or taller, “not very muscular, but athletically built with bushy eyebrows”.

After being woken, she said she had heard one of her housemates say something like “there’s someone here”.

She said she later heard a male voice say something to the effect of “it’s ok, I’m going to help you”.

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Police stop Idaho suspect weeks before arrest

The court documents also revealed the DNA of Bryan Kohberger, the man accused of stabbing to death Kaylee Goncalves, Madison Mogen, Xana Kernodle and Ethan Chapin on 13 November, was found on the button of a knife sheath at the crime scene.

More on Idaho Student Murders

In the affidavit, Police Corporal Brett Payne said phone data showed Kohberger visited the area near the home where they lived around a dozen times before the attack. He said those apparent visits all occurred late in the evening or early morning hours.

The documents also said video footage captured a white Elantra, similar to a car registered to Kohberger, passing the house three times on the night of the murders before the driver attempted to park.

About 15 minutes later the car was seen leaving at a “high rate of speed”.

Suspect extradited from Pennsylvania to Idaho

Kohberger, a 28-year-old criminology student, was extradited from Pennsylvania, where he was arrested, to Idaho yesterday. He appeared in court today.

The suspect has been charged with four counts of first-degree murder and felony burglary.

His attorney in Pennsylvania has said he is eager to be exonerated and described him as “an ordinary guy”.