Bryan Kohberger’s New Evidence After the Guilty Plea

The new evidence in the Bryan Kohberger case after his guilty plea came out in waves: hundreds of pages of Moscow Police investigative files, more than 550 pages from the Idaho State Police, FBI laboratory reports, and a 2026 book by a former defense-hired criminologist that reproduced photographs and questioned the chain of custody on the Ka-Bar knife sheath. Kohberger pleaded guilty on July 2, 2025, to four counts of first-degree murder and one count of burglary, and was sentenced on July 23, 2025, to four consecutive life terms without parole plus ten years, with all appeal rights waived.¹² With the long-standing gag order lifted, material that had been sealed for more than two years became public.³

What the Moscow Police Files Revealed

On July 23, 2025, the day of sentencing, the Moscow Police Department released hundreds of investigative documents. A former friend identified only as “L” told investigators he had noticed injuries on Kohberger’s face and hands in October and November 2022, including what looked like fingernail scratches and wounded knuckles. Kohberger told the friend the marks came from a car accident. The same friend described Kohberger as “intelligent but also selfish” and prone to misleading others.⁴

A female student who had been in a class where Kohberger served as a teaching assistant reported seeing photos of her and her friends on his phone while she was watching a Dateline special about the murders. She believed the images had come from her public Instagram account. Responding officers described signs of an “intense struggle” inside the King Road house, and one officer stated that Kaylee Goncalves was “unrecognizable” due to facial injuries.⁴

Among the more striking witness statements: a dancer at a Pennsylvania club identified Kohberger and told investigators he had spoken about “wanting to kill people” during a private dance. She said he directed her to maintain constant eye contact while pressing her with personal questions about where she lived and what she drove. Victim injury reports indicated that Goncalves and Xana Kernodle sustained extensive defensive knife wounds and that some of the four victims had been stabbed more than 30 times.⁵

What the Idaho State Police Records Added

In August 2025, the Idaho State Police released more than 550 pages of additional records. They describe how peers and students at Washington State University consistently portrayed Kohberger as “creepy,” “off,” and “strange.” Female classmates reported he was condescending and argued their viewpoints were wrong. One female student formally complained to school officials, who told her she “should never be left alone with Kohberger.” A classmate described him as a misogynist and said some in the department suspected he was a “possible future rapist.”⁶

Detectives had also looked at discussions of potential “incel” behavior tied to Kohberger’s Reddit activity. A female classmate recalled him saying that “all women in their field of entry will be in trouble once he enters the workplace.”⁶

These files added to what had already been reported about his semester at WSU. Female students had reported feeling uncomfortable around him during fall 2022, and in one instance he was accused of following a female student to her car. Less than two weeks before the November 13, 2022, killings, Kohberger met with faculty to discuss growing concerns about his behavior. In December 2022, the criminal justice department terminated him as a teaching assistant, citing “unsatisfactory performance” and a failure to meet “norms of professional behavior.” He had also been counseled for a verbal altercation with a professor.⁷

How Much DNA Was Actually on the Sheath

The single most important piece of physical evidence was a Ka-Bar knife sheath found on the bed next to Madison Mogen’s body. Idaho State Police lab work identified a single source of male DNA on the button snap.⁸ For much of the pretrial period, that DNA was publicly characterized as a trace or “touch” sample. After the plea, Othram founder David Mittelman said the amount recovered was far greater than initially reported, calling it “tons of DNA,” reportedly hundreds of times more than a typical case.⁹

The genetic profile Othram generated within 48 hours pointed toward a multigenerational American family with Italian ancestry, which led investigators to Kohberger. A trash pull at the Kohberger family residence in Pennsylvania produced DNA indicating the contributor could not be excluded as the biological father of the profile on the sheath, at a statistical certainty exceeding 99.9998 percent of the male population. A cheek swab taken after his arrest confirmed the match. Prosecutors described the STR DNA comparison as being “at least 5.37 octillion times more likely” to match Kohberger than a random unrelated individual.¹⁰

FBI Lab Reports on Hairs Found at the Scene

Court filings released around the plea showed that both sides had stipulated to the admission of FBI laboratory reports on trace evidence. One report examined debris collected from Ethan Chapin’s right hand for hairs microscopically consistent with samples from Kohberger. None were found. A separate report examined items from Kohberger’s vehicle and his parents’ home for hairs consistent with any of the four victims, and again found no matches.¹¹ The FBI reports cautioned that an inability to match hairs does not necessarily mean there was no contact, pointing to factors such as failure of transfer or loss of evidence before collection.

The Broken Plea Book and the Chain-of-Custody Dispute

In April 2026, journalist Christopher Whitcomb published Broken Plea: The Explosive Search for Truth Behind the Idaho Murders, drawing on interviews with defense-hired criminologist Brent Turvey and reproducing photographs of evidence that had not been public before. The book’s central claim was that documentation for the Ka-Bar knife sheath had flaws serious enough that it might have been ruled inadmissible at trial.

According to Turvey and the book, the evidence bag containing the sheath appeared to have been documented twice. Detective Brett Payne initialed it “BP” and dated it November 14, 2022. Idaho State Police forensic specialist Shannon Arredondo signed and dated the bag on November 16, 2022. A label affixed to the bag contained six recorded exchanges written in similar handwriting with a single pen. Turvey argued that chain-of-custody forms are supposed to be created in real time as evidence changes hands, and characterized the documentation as flawed.¹²

The book also reported that wisps of hair photographed at the scene in or beneath Chapin’s hand were never processed or tested, and that FBI lab results excluded Kohberger as the source of that hair. Turvey, who reviewed evidence in person in Moscow, said the crime scene indicated at least two perpetrators. Prosecution expert T. Paulette Sutton disputed that reading, saying she found no physical evidence requiring more than one attacker.¹²

The book’s publication set off an unusually public fight between Turvey and his former team. On April 28, 2026, the Anne Taylor Law Offices issued a statement accusing Turvey of violating the confidentiality agreement he had signed on October 30, 2024, and calling his public comments “outside of the ethical and legal norms that are applied to experts in criminal cases.” Turvey denied the accusations, said the information he shared was already public or contained within discovery, and alleged that he spoke out because “extraordinary types of exculpatory evidence” were being buried or misstated.¹³¹⁴

Because Kohberger waived his right to appeal as part of the plea agreement, none of the chain-of-custody arguments raised in the book can be tested in court.¹⁵

What the Records Say About Motive

No official motive has been established. Kohberger offered no explanation at his sentencing hearing, saying only, “I respectfully decline” when given the chance to speak.¹⁶ Detectives confirmed there was no social media connection between Kohberger and any of the four victims.⁵

Cellphone records showed Kohberger’s phone was near the King Road house at least 12 times between August 2022 and the night of the murders, typically during late-night hours. Investigative reporter Vicky Ward, author of The Idaho Four: An American Tragedy, wrote that there was consensus among investigators and the victims’ families that Kohberger had been targeting Madison Mogen, who was identified as the first victim killed. The book cited a theory from a friend of the victims that Kohberger had visited the restaurant where Mogen worked, expressed romantic interest, and retaliated after being rejected. The friend acknowledged this was “her best guess.”¹⁷ Other post-sentencing books and documentaries speculated about anger over romantic rejections or an attempt to emulate misogynist killer Elliot Rodger. None of these theories have been confirmed.³

Released documents and reporting noted Kohberger had a history of depression, a former heroin addiction, and what the BBC described as a “fascination with criminals,” having studied under forensic psychologist Katherine Ramsland.³

The Amazon Knife Records and the Missing Weapon

Unsealed court filings confirmed that prosecutors planned to introduce Kohberger’s Amazon purchase history at trial. Records showed he bought a Ka-Bar knife, sheath, and sharpener from Amazon in March 2022, eight months before the killings. His Amazon click history also showed he searched for a Ka-Bar knife in the days after the murders, which prosecutors argued demonstrated consciousness of guilt.¹⁸ The murder weapon itself has never been recovered.⁵

Prosecutor Bill Thompson also described Kohberger’s 2015 white Hyundai Elantra as “spotless” by the time investigators examined it, saying the interior had been essentially disassembled and stripped clean. Kohberger had changed the car’s registration from Pennsylvania to Washington State five days after the murders, which added a front license plate requirement. Investigators found the timing significant because the vehicle had been harder to track on cameras without a front plate.¹⁹

Where Kohberger Is Now, and What Remains Sealed

Kohberger is held at the Idaho Maximum Security Institution, placed in long-term restrictive housing in J Block, a unit that also houses death row inmates and those in protective custody. Inmates in J Block are kept in single-person cells, moved in restraints, allowed one hour of outdoor recreation daily, and permitted to shower every other day.²⁰

Not everything from the file has been released. In October 2025, Second District Judge Megan Marshall ruled to block public release of graphic crime scene photos, finding that dissemination would constitute an “unwarranted invasion of personal privacy” and could cause the victims’ families “extreme emotional distress.” The families of Mogen and Chapin had petitioned to keep those images sealed. The judge ordered the city of Moscow to redact portions of images showing victims’ bodies while allowing non-graphic materials, including witness interview videos, to be released.²¹ Judge Steven Hippler said at sentencing he was continuing to review materials to determine whether additional documents could be made public. More is likely still to come.

1
NBC News. Bryan Kohberger Guilty Plea Idaho Murders Live Updates
2
ABC7. Bryan Kohberger Sentencing Live Updates
3
BBC News. Bryan Kohberger Case
4
CNN. Unsealed Documents Bryan Kohberger Case
5
KUOW. Investigative Documents in Kohberger Case Released to the Public
6
Idaho News. More Than 550 Pages of Idaho State Police Records Released
7
New York Times. Idaho Murders Kohberger Fired WSU
8
WBAL-TV. Bryan Kohberger Knife Sheath Trial
9
Fox 13 News. Bryan Kohberger Left Behind Far More DNA Than Previously Known
10
CNN. Bryan Kohberger DNA Match Idaho Killings Evidence
11
Idaho Courts. Stipulated Motion to Admission of Additional Exhibits as Evidence at Trial
12
WFMD. Idaho Murders New Book on Kohberger Reveals Previously Unseen Evidence
13
Idaho Statesman. Kohberger Defense Team Accuses Expert of Violating Confidentiality Agreement
14
New York Post. Kohberger Defense Team Says It Is Appalled by Former Expert’s Public Comments
15
Idaho Courts. Plea Agreement, Case No. CR01-24-31665
16
CNN. Family Impact Statements Idaho Murders
17
ABC News. New Book on University of Idaho Murders Sheds Light on Bryan Kohberger
18
Court TV. Prosecutors: Bryan Kohberger Bought Knife on Amazon Months Before Killings
19
ABC7. Tip, Spotless Car Were Key Evidence Linking Bryan Kohberger to Murders
20
CNN. Bryan Kohberger Solitary Confinement
21
ABC7. Idaho Judge Bars Release of Graphic Crime Scene Photos