ATF Cannot Match Bullet That Killed Charlie Kirk to Suspect's Rifle, Defense Filing Reveals

The Forensic Gap

Defense attorneys for Tyler Robinson, the 22-year-old charged with the assassination of conservative commentator Charlie Kirk, disclosed in a court filing on Friday, March 27 that the Bureau of Alcohol, Tobacco, Firearms and Explosives "was unable to identify the bullet recovered at autopsy to the rifle allegedly tied to Mr. Robinson," according to the motion obtained by multiple outlets including TMZ and the Deseret News.

The filing, submitted to the Fourth District Court in Utah, represents a significant development in the high-profile capital murder case. Kirk, 31, was shot dead on the campus of Utah Valley University on September 10, 2025. Robinson faces aggravated murder charges that carry a potential death sentence.

Robinson's defense team indicated in the motion that it may call the ATF firearm analyst as a witness to present what they described as exculpatory evidence. The motion states that although prosecutors have not indicated plans to introduce the ATF ballistic report at the preliminary hearing, the defense reserves the right to do so.

A Second Analysis Still in Progress

The ballistic mismatch is not the only forensic complication in the case. According to KUTV's reporting on the motion, the FBI is separately conducting a second comparative bullet analysis, as well as a bullet lead analysis, both of which remain incomplete.

The defense argued in the filing that until it receives the case files and protocols relating to these analyses — and has them independently evaluated by its own expert — it cannot properly assess the reliability of the evidence regardless of which side introduces it.

DNA evidence is also proving complex. The defense motion, as reported by the Deseret News, notes that FBI and ATF reports indicated multiple quantities of DNA were found on certain items of evidence. The filing states that determining the number of contributors to a DNA mixture and evaluating whether federal agencies "reliably applied validated and correct scientific procedures" requires experts in forensic biology, genetics, systems engineering, and statistics.

20,000 Files and Counting

The defense is also contending with the sheer volume of evidence. According to TMZ, which obtained the legal documents, prosecutors have already handed over approximately 20,000 electronic files comprising roughly 61,500 pages, 31 hours of audio, and more than 700 hours of video across over 5,000 clips.

Robinson's attorneys told the court that a comprehensive first pass through the material will take at least 60 days. The defense is requesting that the preliminary hearing — currently scheduled for May 18, 19, and 21, according to the Deseret News — be either continued or vacated with new dates to be set later. They are seeking a delay of at least six months.

The motion invoked Robinson's rights under the Sixth and Eighth Amendments to the U.S. Constitution, as well as Utah Rule of Criminal Procedure 7B(a), arguing that he cannot exercise his right to meaningful cross-examination or effective assistance of counsel without adequate time to review the evidence, KUTV reported.

What Prosecutors Plan to Present

Based on a March 12 meeting between defense attorneys and prosecutors, the defense believes the state intends to present evidence at the preliminary hearing through three law enforcement witnesses. According to the filing as reported by the Deseret News, the prosecution's case will include forensic DNA and ballistic reports authored by the FBI and ATF, phone and social media data, testimony about the crime scene and search locations, and testimony from Robinson's parents and roommate.

The defense also noted that prosecutors plan to rely on what the filing described as "a significant amount of hearsay" from "nontestifying peace officers."

Robinson is next scheduled in court on April 17, according to KUTV.

Background: The Kirk Assassination

Kirk, the founder of Turning Point USA and a prominent conservative media figure, was shot while visiting Utah Valley University's campus on September 10, 2025. Prosecutors allege Robinson drove approximately three hours from his home to the campus to carry out the killing.

Robinson was turned over to authorities by his own father, Matt Robinson, who reportedly recognized a rifle belonging to his father — Tyler's grandfather — in images released by police during the manhunt. Matt Robinson contacted law enforcement after his son was unable to produce the family heirloom when asked, according to court documents previously reported by TMZ and the Daily Mail.

Text messages between Robinson and his roommate and partner, Lance Twiggs, were included in earlier court filings. In those messages, Robinson allegedly discussed retrieving the rifle from a "drop point" and expressed regret about not recovering the weapon immediately after the shooting, stating he had not seen reports of police finding it.

Robinson's defense has also pushed for the trial to be televised, arguing in a separate filing that public court proceedings help counter misinformation, while secrecy fuels conspiracy theories.

What Comes Next

The ballistic discrepancy does not, on its own, exonerate Robinson — the ATF report indicates only that the agency was unable to make a positive identification between the bullet and the rifle, not that it conclusively ruled out a match. The FBI's second analysis, still ongoing, may provide additional clarity.

However, in a capital case where the defendant faces the death penalty, gaps in forensic evidence carry heightened significance. The defense's ability to challenge the prosecution's physical evidence at the preliminary hearing — where a judge will determine whether there is probable cause to proceed to trial — could shape the trajectory of the entire case.

A ruling on the motion to delay the preliminary hearing has not yet been issued. The Utah County Attorney's Office has not publicly responded to the defense filing.