The initial assessment by the police in the small town of Moscow, Idaho, that the murder of four students in mid-November was “a targeted attack” appears to have been confirmed.

In the days leading up to the crime, the suspect's small white car was repeatedly spotted near the King Road home where Madison Mogen, Kaylee Goncalves, Xana Kernodle and Ethan Chapin were staying, chief investigator Brett Payne's now-released transcript shows were stabbed early in the morning of November 13.

Shortly before the crime, surveillance cameras captured 28-year-old Bryan Kohberger's car at least four more times in front of the light gray house on King Road.

Kohberger, who was arrested at his parents' home in Pennsylvania on December 30 following investigations by the Moscow Police Department, the Idaho State Police and the Federal Police (FBI), nevertheless pleaded not guilty to the charges.

Through his defense attorney Jason LaBar, the criminology graduate student said he was confident he would be acquitted.

The evidence that lead investigator Payne and his colleagues have now amassed points in a different direction.

After an emergency call from a roommate of the killed students, the officer discovered a knife sheath next to one of the four bodies.

The genetic material that forensic scientists later discovered on the leather case can be assigned to Kohberger.

Before the arrest, the 28-year-old had been observed for days.

In a garbage can owned by his parents in Pennsylvania, investigators eventually found DNA that could be traced back to the father of the person who left the knife sheath at the scene.

Why did the roommate only call the police eight hours later?

In addition, one of the two roommates of the victims, 21-year-old Dylan Mortensen, is said to have charged Kohberger.

She was woken up around four in the morning by unfamiliar noises in the house.

When the student opened the door of her room, she saw a man with a mask and bushy eyebrows.

As the investigators found when comparing the description of the perpetrator with the photo on the alleged perpetrator's driver's license, Kohberger's eyebrows grow unusually lush.

The student, who has been enrolled as a doctoral student at Washington State University about 15 kilometers from Moscow since the fall, drove to the crime scene again a few hours after the crime.

"Analysis of the telephone data shows that he left his apartment in Pullman around nine o'clock and drove to Moscow.

Between 9.12 a.m. and 9.

Despite surveillance cameras, web checks and DNA, the "Idaho Killings" remain a mystery.

So far, investigators have been unable to find a motive or the murder weapon.

The emergency call from roommate Mortensen continues to raise questions.

Why did the 21-year-old only alert the police eight hours after meeting the masked stranger?

And why didn't the perpetrator stab her too?

Meanwhile, Kohberger, who was transferred from Pennsylvania to Idaho, remains silent.

The next court hearing awaits him on Thursday.