The defense team of alleged Idaho quadruple-killer Brian Kohberger is aiming to exclude the testimony of the victims’ roommate from his murder case, a legal move that could potentially result in his acquittal.

During this week’s hearings, the focus is on determining the admissibility of evidence in his trial, including the DNA evidence allegedly discovered on a knife sheath located inside the home in Moscow, Idaho, where four students were fatally stabbed more than two years ago.

Lead defense lawyer Anne Taylor criticized the investigation of her client, contending that it was carried out with limited transparency and, therefore, should not be considered valid for admission.

‘This is a situation where this identification was done in complete secret behind closed doors,’ she said.

Taylor specifically cited the testimony of one of the two surviving roommates of the four victims given shortly after the murders. 

‘There are two references to not remembering. And a couple of days later in the third interview, there are references to not remembering, being drunk,’ Taylor said. 

‘A statement, ‘I don’t know any of it, like half this stuff I don’t know if it was a dream or if it’s real.’ And credibility is really, really important when this person was relied on in the investigation.’

Taylor noted that the roommate testified to having heard one of the victims go up and down the stairs when the attack happened, which ‘they know… is wrong.’

The judge was never told this information at the time which led to her questioning how this investigation was conducted, connecting back to the gathering of DNA from the button snap of a knife sheath. 

Taylor also hammered away at the investigators’ use of investigative genetic genealogy, which she claims is unreliable. 

The process involves taking DNA samples and putting them through a federal criminal database but experts claim authorities can take it to a different database .  

The defense argues the FBI didn’t have a warrant to collaborate with a local trash collector in his Pennsylvania neighborhood to find the DNA that connected them to Kohberger. 

‘I think it’s interesting when you have the FBI telling the trash man what to do,’ Taylor said. 

‘There was nothing obtained that violated the defendant’s constitutional rights,’ Ashley Jennings, representing the prosecution, responded. 

‘The defendant has failed to submit any false statement or admission, without which the magistrate would not have found probable cause.’

Although the murder weapon has never been found, officials say the DNA on the sheath matched Kohberger’s genetic profile, which was compiled by taking genetic data from distant relatives on public databases. 

District Judge Steven Hippler still hasn’t made a decision as to what would be open to the public, saying he was concerned by fervent media and public attention on Kohberger’s murder case as he tries to ensure a fair trial. 

While noting he hoped to show ‘as much as possible’ of Kohberger’s case to the public, Hippler said he would close the DNA evidence portion of the hearing as he can’t ‘unring the bell’ once potentially shocking information is heard. 

The judge indicated that other portions of the hearings would be streamed online but the courtroom would be closed, due to concerns that he may have to unexpectedly close brief aspects of the hearings.

It comes as the case against Kohberger – who has not appeared in court for three months – has been delayed several times since his arrest in December 2022, with the accused killer now set to stand trial in August 2025. 

Latah County officials say they intend to seek the death penalty if he is convicted over the grisly murders of Kaylee Goncalves, Madison Mogen, Xana Kernodle, and Ethan Chapin, in their off-campus home in November 2022. 

Partial DNA evidence found on a Ka-Bar knife sheath found at the scene of the murders was a key piece of evidence used by law enforcement to indict and arrest Kohberger. 

Kohberger’s attorneys argue that this method of how the DNA evidence was obtained violated his constitutional rights, with the DNA evidence’s admissibility set to be decided this week. 

His initial trial date was set for October 2023. However, his lead defense attorney Anne Taylor has filed for multiple extensions and further hearings since his arrest, sparking anger from the victims’ families. 

Kohberger’s team also delayed revealing his official alibi until May 2024, and when he finally did so, prosecutors and the public reacted with dismay as he claimed he was ‘driving alone’ on the night of the murders ‘to look at the moon and stars.’ 

In that filing, Taylor said she would be calling on a phone data analysis expert to back up his claims he was miles from the scene, which is one of the pieces of evidence prosecutors and the defense have repeatedly clashed over. 

Kohberger has maintained his innocence since his arrest in December 2022, over a month after the murders that shocked the nation.

Social media flew into a frenzy after his arrest as internet sleuths pored over the lanky teaching assistant’s history, revealing everything from his middle-school bullying at the hands of popular classmates to his humiliating Tinder dates. 

The month-long search for the alleged killer led to widespread media attention, with the families of the victims since using the spotlight to condemn the proceedings against Kohberger.

In December 2023, the mother of victim Kaylee Goncalves said the ongoing process has been ‘gut wrenching.’

‘It’s gut-wrenching how slow everything has to go. Why does this have to be so drawn out?’ Kaylee’s mother Krisi said in an interview with KHQ.

‘It’s important, I get it, but there are facts, we have certain facts, we have certain knowledge. I can’t believe that this is how it works.’ 

In December 2023, Idaho officials again came under fire after the off-campus home where the four students were stabbed to death was torn down, against the victim’s families’ wishes.

Although both prosecution and defense agreed for it to be torn down, the families argued against it, with Goncalves’ loved ones fearing the move would ‘destroy one of the most critical pieces of evidence in the case.’

Before it was torn down, the scenes inside the home were so gruesome that exclusive DailyMail.com images showed blood seeping down the outsides of the property.

When he was arrested, prosecutors cited partial DNA matches found on a Ka-Bar knife sheath found at the home. No murder weapon has ever been found.

In an ongoing back-and-forth over such evidence in court – also including cell phone data and surveillance allegedly of Kohberger’s car at the crime scene – the defense claimed that prosecutors have not turned over what they may present in court.

Taylor filed a motion last summer to compel the defense to do so, with the defense countering that they are restricted by some federal laws due to the FBI’s involvement in the case.

The defense has also filed to dismiss the entire case, claiming he was indicted by a biased grand jury and the case was tainted by misconduct by the prosecution and the admission of invalid evidence. The motion was denied.

Last month, it emerged that Kohberger was previously investigated in connection to a home invasion in Pullman, Washington in October 2021, just 10 miles from the quadruple murders in Moscow, Idaho. He was never charged in that investigation.