Bryan Kohberger’s sister feared that her brother was involved in the stabbings of four University of Idaho students before police swooped on their parents’ home and arrested him for murder, according to a bombshell report.

Sources told NBC’s Dateline that one of the accused killer’s older siblings grew increasingly suspicious of her brother and his behaviour when the family gathered to spend the holidays together.

Her suspicions were so great that – at one point – several family members searched Mr Kohberger’s white Hyundai Elantra for possible evidence of the crime, they said.

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Tinder, DoorDash and Venmo are among dozens of businesses that have been served with search warrants in the University of Idaho murders case.

Court documents filed last week reveal that investigators probing the brutal slayings of Kaylee Goncalves, Madison Mogen, Ethan Chapin and Xana Kernodle have issued warrants to around 40 companies as they pursue murder charges against accused killer Bryan Kohberger.

Any evidence the searches may have uncovered remains unknown as the judge ordered that the warrants remain sealed and redacted.

Bryan Kohberger will appear in Latah County Court on Monday morning for his arraignment.

At an arraignment, a defendant has the criminal charges and their rights read to them.

They are also asked to enter a plea on the charges. In Idaho, a defendant can plead guilty or not guilty.

Bryan Kohberger will be arraigned today on four counts of first-degree murder and one count of felony burglary.

During his arraignment, he will be asked to enter a plea of guilty or not guilty on each of the charges.

If he enters a not guilty plea, the judge will set a date for his trial to begin.

If he pleads guilty, the judge will order a presentence investigation.

This involves an investigator compiling information about the defendant – such as prior criminal record, social history, employment – which will then help the judge decide an appropriate sentence.

Bryan Kohberger became a household name across America when police swooped on his parents’ home in December and arrested him for the brutal murders of four University of Idaho students.

Mr Kohberger, then a PhD criminology student at Washington State University, was accused of stabbing to death Kaylee Goncalves, Madison Mogen, Xana Kernodle and Ethan Chapin in an off-campus student rental home in Moscow, Idaho, on 13 November.

The victims’ loved ones and those following developments in the quadruple murder case went from weeks of near-silence from law enforcement to the bombshell news of the accused killer’s arrest six weeks later.

Since then, people from Mr Kohberger’s past – though shocked – have built a picture of a bullied loner who overcame addiction. Meanwhile, fellow students from his time just over the Idaho border into Washington describe a criminology zealot who “creeped people out”.

With the 28-year-old set to be arraigned on four counts of murder and one burglary charge on Monday, The Independent asks: Who really is Bryan Kohberger?

After weeks of no updates on the investigation, law enforcement in Idaho and Pennsylvania announced Bryan Kohberger’s arrest on 30 December. A search warrant was executed at Mr Kohberger’s apartment in Pullman, Washington, the same day he was arrested at his parents’ home in Pennsylvania.

A record of evidence recovered during the apartment search revealed the seizure of 15 items including hairs, receipts, a computer tower, a disposable glove and items with peculiar stains.

In the search warrant record, investigators list several items with stains, including cuttings of a mattress cover, a “reddish/brown” stain on an uncovered pillow and a “collection of dark red spot”. Dr Monte Miller, a former crime scene investigator and forensic expert, and former FBI agent Jennifer Coffindaffer told The Independent back in January that investigators most likely believed those items had blood stains.

“A reddish or brown stain is a euphemism for, ‘We found something that looks like blood,’” Dr Miller said at the time. “It might be blood from the victims, might be his blood. They don’t know until they test it, but they’ll be able to get DNA if it is blood. We don’t know what the stains in the cover sheets look like, but again they’re looking for any kind of DNA, evidence that might have come from the crime scene.”

Ms Coffindaffer added: “They don’t call it blood, but it’s definitely inferred that it was blood.”

Court documents, released by Washington authorities on 4 May showed that multiple items taken from Mr Kohberger’s apartment in Pullman had been tested for the presence of blood. While most items came back negative, two unspecified items were positive.

Another item included on the list of seizures was a “possible animal hair strand”. While Mr Kohberger is not believed to have a pet, one of the victims he is accused of killing, Goncalves, had a dog that was at home at the time of the murders and was later found by police responding to the scene.

“The possible animal hair they’ll try to connect that to the dog left at the scene,” according to Dr Miller. “If there’s a root on that, if there is any skin on that hair, they could do a DNA test with that dog. If it’s just a hair that’s been shed and there is no skin, they would still be able to do a microscopical comparison and exclude most dogs but they wouldn’t be able to connect it necessarily to that dog.”

Mr Kohberger was also linked to the crime through cellphone records and his white Hyundai Elantra, a similar model of the car seen near the murder home around the time of the murders. Mr Kohberger changed the license plates on his Hyundai Elantra just days after the murders.

At the time of the murders, Bryan Kohberger was studying for his PhD and working as a teaching assistant in criminal justice at WSU.

Prior to this, Mr Kohberger studied criminology at DeSales University first as an undergraduate and then finishing his graduate studies in June 2022.

According to online school records, Mr Kohberger received an associate arts degree in 2018 from Northampton Community College in Albrightsville and received a masters degree in criminal justice this year from DeSales University.

While studying at DeSales, he studied under renowned forensic psychologist Katherine Ramsland who interviewed the BTK serial killer and co-wrote the book Confession of a Serial Killer: The Untold Story of Dennis Rader, the BTK Killer with him.

He was working part-time as a security guard until August 2021 at Pleasant Valley School District, where his mother was listed as a paraprofessional.

The alleged murderer carried out a research project “to understand how emotions and psychological traits influence decision-making when committing a crime”.

Mr Kohberger reached out to potential participants on Reddit, with the chilling survey resurfacing after his arrest.

“In particular, this study seeks to understand the story behind your most recent criminal offense, with an emphasis on your thoughts and feelings throughout your experience,” the post said.

His fascination appears to have continued around the time of the murders when he applied for an internship with the local police department.

The affidavit revealed that he applied for an internship in the fall of 2022 with the Pullman Police Department and wrote in an essay how he had an interest “in assisting rural law enforcement agencies with how to better collect and analyze technological data in public safety operations”.

The father of slain University of Idaho student Kaylee Goncalves has expressed his support for the young women who survived the attack in which his daughter was killed.

Dylan Mortensen and Brittany Funke were inside their off-campus home in Moscow when roommates Goncalves, Madison Mogen, Xana Kernodle and Kernodle’s boyfriend Ethan Chapin were stabbed to death in the early morning hours of 13 November.

According to an affidavit released earlier this year, Ms Mortensen told investigators that on the night of the murders, she saw “a figure clad in black clothing and a mask that covered the person’s mouth and nose walking towards her”.

The Independent’s Andrea Blanco has the story:

Kaylee Goncalves and Madison Mogen, both 21, were seniors at the University of Idaho and were expected to graduate this year.

At a vigil weeks after the murders, Goncalves’ father Steve Goncalves told how the two “absolutely beautiful” young women first met in sixth grade and became inseparable.

“They just found each other and every day they did homework together, they came to our house together, they shared everything,” he said at the time. “Then they started looking at colleges, they came here together. They eventually get into the same apartment together.

“And in the end, they died together, in the same room, in the same bed.”

Xana Kernodle and Ethan Chapin were juniors at the college and had begun dating months before their deaths. The couple of 20-year-olds is believed to have been awake at the time the stabbings were carried out.

Six months after the stabbings, the families of the slain students accepted posthumous awards for their achievements.

Mogen and Goncalves’ relatives walked across the stage for their degrees in an emotional ceremony on 13 May. Kernodle’s family also accepted her certificate in marketing at a separate ceremony while Chapin’s award in sports, recreation and management was mailed to his parents.

Kernodle’s family accepted her certificate in marketing at a private ceremony last week while Chapin’s award in sports, recreation and management will be mailed to his parents this week.