MOSCOW, Idaho — After weeks of unease over the murders of 4 College of Idaho college students in a home close to campus, the authorities this week launched their most detailed account but of the investigation that led them to arrest a criminology pupil from a close-by college.

The paperwork element an array of proof concerning the suspect, Bryan Kohberger, 28, a graduate pupil at Washington State College, who mentioned via a lawyer that he appears ahead to being exonerated. The information additionally supplied jarring new particulars concerning the evening the 4 college students have been murdered, whereas elevating contemporary questions on a mystifying case through which authorities haven’t defined a potential motive.

Listed below are 10 key revelations made public on Thursday.

A roommate noticed a masked man.

Investigators had beforehand urged that two roommates who have been inside the home on the evening of the crime and weren’t attacked had been sleeping. However the information present that considered one of them awoke round 4 a.m. after listening to noises, a person’s voice and crying. That was across the time the authorities imagine the killings occurred.

That roommate, in response to the information, ultimately watched from her room as a person in black clothes with a masks on his face walked previous her towards the house’s again door. She reported locking her personal bed room door at that time, but it surely’s unclear from the information what transpired afterward.

Authorities weren’t summoned to the scene for greater than seven hours.

Investigators discovered a knife sheath on the scene.

On an upstairs mattress the place two victims — Madison Mogen and Kaylee Goncalves — have been discovered lifeless, investigators mentioned they discovered a tan leather-based knife sheath.

The police mentioned they have been capable of get a DNA pattern from a button snap on the sheath, and later discovered a connection between that pattern and DNA collected from Mr. Kohberger’s mother and father’ dwelling in Pennsylvania.

That will show to be a key piece of proof, as authorities search to tie Mr. Kohberger to the scene of the crime.

The suspect utilized to work at a neighborhood police division.

Mr. Kohberger had lengthy taken an curiosity in criminology and legal regulation.

He studied in Pennsylvania partially beneath Katherine Ramsland, a forensic psychologist whose books embrace “The Thoughts of a Assassin” and “The best way to Catch a Killer.” He researched the psychology of criminals once they dedicated crimes.

At Washington State College, he was pursuing a Ph.D., participating in a category on DNA proof and forensics within the weeks earlier than the killings, whereas persevering with to grade papers within the weeks afterward.

Authorities additionally disclosed that Mr. Kohberger had utilized in current months for an internship on the police division in Pullman, Wash., lower than 10 miles from the College of Idaho campus in Moscow. He wrote an essay as a part of the applying through which he described his curiosity in serving to rural police departments accumulate and analyze knowledge.

A automobile handed the victims’ home a number of instances.

On the evening of the killings, investigators mentioned, a white vehicle might be seen on surveillance footage repeatedly passing via the dead-end avenue the place the victims lived.

The automobile, which the police mentioned was a Hyundai Elantra, began showing round 3:29 a.m., passing by the world thrice earlier than returning for a fourth time at 4:04 a.m., across the time that the surviving roommate was woke up and that the police imagine the killings occurred. The automobile, the police mentioned, might be seen rushing away from the world at 4:20 a.m.

Audio captured a canine barking.

At round 4:17 a.m., a safety digital camera close to the house of the victims picked up distorted audio of what appeared like a whimper and a loud thud, investigators mentioned. Additionally they mentioned a canine might be heard barking quite a few instances.

After the killings have been found, law enforcement officials arriving on the home discovered a canine in one of many rooms. The canine belonged to one of many victims, Kaylee Goncalves.

One of many victims might have been awake.

Whereas the coroner has mentioned that each one 4 victims have been in all probability asleep on the time of the killings, investigators urged within the new courtroom information that a minimum of considered one of them might have been awake.

Xana Kernodle obtained a DoorDash supply round 4 a.m., simply earlier than the arrival of the white automobile, the investigators mentioned. A forensic assessment of her cellphone additionally urged that she was utilizing the TikTok app at round 4:12 a.m.

A campus officer discovered Kohberger’s automobile.

With the surveillance video in hand, the police started scouring the area for white Hyundai Elantras, and a campus police officer at Washington State College discovered one in November registered to Mr. Kohberger.

Investigators mentioned they reviewed photos of Mr. Kohberger and located that his bodily look matched the recollection of the roommate who noticed a person in the home, together with his peak, construct and bushy eyebrows.

Police initially mentioned they have been on the lookout for a 2011-13 Elantra, however later decided that it is also from a mannequin 12 months as late as 2016. Mr. Kohberger had a 2015 Elantra.

Kohberger’s cellphone disconnected throughout the killings.

By the top of December, investigators have been capable of get information of the situation of Mr. Kohberger’s cellphone.

The information confirmed that he had visited the neighborhood of the crime scene 12 instances earlier than the evening of the killings, in response to the police affidavit. On the evening of the killings, his cellphone was in Pullman at 2:47 a.m., however then disconnected from the cell community.

The cellphone reconnected to the community at 4:48 a.m., at a location miles to the south of the College of Idaho. The cellphone ultimately traveled again to Pullman.

The police recommend that the suspect might have returned to the crime scene.

A number of hours after the killings, at round 9:12 a.m., Mr. Kohberger’s cellphone was detected in Moscow, connecting to the mobile community close to the scene of the murders and staying there for 9 minutes, in response to the police information.

The cellphone then returned to the world of his dwelling in Pullman. At that time within the morning, nobody had known as 911, so the police had not but gone to the crime scene.

A DNA pattern was taken from trash in Pennsylvania.

Within the days after acquiring Mr. Kohberger’s cellphone information, investigators have been in Pennsylvania, the place Mr. Kohberger had pushed for the vacations along with his father.

Brokers there recovered trash from the house of Mr. Kohberger’s household and shipped it to Idaho. Investigators mentioned they labored to match a DNA profile discovered within the trash to a DNA pattern collected from the knife sheath discovered on the crime scene. The evaluation, the police mentioned, indicated that the elder Mr. Kohberger was the daddy of whoever left DNA on the knife sheath.