On Friday, a graduate student at Washington State University was arrested in connection with the horrifying Idaho murders that saw the deaths of four students.
Here's what we know of the killer so far.
As per CNN, a criminal complaint was filed against Bryan Christopher Kohberger on Thursday charging the 28-year-old with four counts of murder in the first degree, as well as felony burglary according to Latah County Prosecutor Bill Thompson.
It was confirmed that Kohberger, who lived just minutes from the scene of the brutal killings, was a PhD student in Washington State University’s Department of Criminal Justice and Criminology.
In a Reddit post that was quickly removed once Kohberger's arrest was announced, it was said that the 28-year-old was conducting a study that he needed participants to help him "understand how emotions and psychological traits influence decision-making when committing a crime", per the New York Post.
"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 read, as per the outlet.
According to the authorities, Kohberger was arrested in his home state of Pennsylvania after they traced the ownership of a white Hyundai Elantra seen in the area of the killings back to him.
Speaking to the outlet, a law enforcement source confirmed that the suspect drove across the country in the white car to his parent’s house, adding that "sometime right before Christmas we were zeroing in on him being in or going to Pennsylvania."
Both locations were under surveillance as the FBI and a local law enforcement team worked together to "develop enough probable cause to obtain a warrant", CNN reports.
They also added that Kohberger’s DNA had been matched to genetic material recovered at the off-campus house where the students were stabbed to death, according to sources.
Records show that the 28-year-old is currently being held without bail.
On Saturday, Monroe County Chief Public Defender Jason Allen LaBar told CNN that Kohberger intends to waive his extradition hearing.
"Mr. Kohberger is eager to be exonerated of these charges and looks forward to resolving these matters as promptly as possible," LaBar said.
Authorities have not yet managed to work out what his motives were or whether he even knew the victims but this will be an important part of the investigation as it continues over the next few weeks.
It's now been almost seven weeks since the brutal killing of four Idaho university students.
Kaylee Goncalves, 21, Madison Mogen, 21, Xana Kernodle, 20, and Ethan Chapin, 20 were found in an off-campus college dorm with horrific stab wounds to the chest.
At the time, there were reportedly no signs of forced entry to the students' residence, and two other female housemates - who police have since reiterated were not involved in the murders - reportedly slept through the entire incident.
During a news conference, Moscow Police Department Chief James Fry said: "These murders have shaken our community and no arrest will ever bring back these young students. However, we do believe justice will be found through the criminal process."
"We developed a clear picture over time,” he said, “(but) be assured that the work is not done.
"This is just started," he added.
On Friday, Elizabeth Chilton, chancellor of the WSU Pullman campus also said that this "horrific act has shaken everyone in the Palouse region."
"On behalf of the WSU Pullman community, I want to offer my sincere thanks to all of the law enforcement agencies that have been working tirelessly to solve this crime," she added.
Rest in peace. Our thoughts are with the family and friends of all the victims during this incredibly difficult time.