Investigators Could Not Match Bullet to Rifle in Charlie Kirk Murder Case
A significant question has emerged in the murder case against Tyler Robinson, the man charged with fatally shooting conservative activist Charlie Kirk: does the bullet match the gun?
Defense attorneys filed a motion on March 27 stating that the Bureau of Alcohol, Tobacco, Firearms and Explosives was unable to identify the bullet recovered during Kirk's autopsy as having been fired from the rifle allegedly tied to Robinson. The defense says it may call the ATF firearm analyst to testify as exculpatory evidence at Robinson's preliminary hearing.
What Happened on September 10
Charlie Kirk, 31, was shot and killed on September 10, 2025, while speaking at an outdoor debate event at Utah Valley University in Orem, Utah. Around 3,000 people were in attendance when Kirk was struck by a single bullet fired from a rooftop approximately 142 yards away. He was transported to a local hospital and pronounced dead.
Robinson, then 22, surrendered to the Washington County Sheriff's Office the following day after a 33-hour manhunt. His family had recognized him in surveillance images shared publicly and urged him to turn himself in.
The Weapon and the Bullet
Authorities identified the alleged murder weapon as a Mauser Model 98, a bolt-action rifle that had belonged to Robinson's grandfather. The weapon — chambered in .30-06 caliber — was recovered near the scene with one spent cartridge in the chamber and three unfired bullets etched with meme-influenced messages.
Ballistics analysts examine microscopic markings left on a bullet as it travels through a gun barrel, similar to fingerprints. In this case, the ATF's summary report indicates those markings could not be conclusively matched to the recovered rifle.
The FBI is conducting a second comparative bullet analysis as well as a bullet lead analysis, but neither has been completed. Defense attorneys said they need those results, along with the ATF's full case file and testing protocols, before they can properly prepare for the preliminary hearing.
A Mountain of Evidence to Review
The volume of evidence in the case is substantial. Prosecutors have already provided the defense with approximately 20,000 files, including more than 700 hours of video and 31 hours of audio. On March 12, the defense received an additional hard drive containing over 600,000 files.
Defense attorneys said a thorough review of what they have will take at least 60 days, and they have not yet determined what may still be missing.
"The defense team has devoted, and will continue to devote, significant resources to processing discovery," the filing states. "The comprehensive review required to determine what is missing will take hundreds of hours."
The defense is asking Judge Tony Graf to delay the preliminary hearing, currently scheduled for May 18, 19, and 21.
What the Prosecution Has
Despite the ballistic uncertainty, prosecutors have assembled a significant case. Robinson allegedly confessed to his father that he shot Kirk. His roommate and romantic partner, Lance Twiggs, turned over private messages in which Robinson discussed the need to retrieve a rifle from a drop point, referenced a scope and engraved bullets, and wrote that he had "enough of his hatred."
Prosecutors intend to call Robinson's parents and Twiggs to testify at the preliminary hearing. Utah County Attorney Jeff Gray is seeking the death penalty.
What Comes Next
Robinson is due back in court on April 17 for a hearing on a defense motion to ban cameras from the courtroom. The preliminary hearing remains scheduled for May pending the judge's decision on the delay request.
Robinson faces seven charges, including aggravated murder. He has not yet entered a plea.
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