Attorneys representing Tyler Robinson, accused of assassinating influential conservative activist Charlie Kirk, are challenging the prosecution’s grounds for seeking the death penalty. In a recent court document released Tuesday night, Robinson’s lawyers assert that the prosecution has not sufficiently justified such a severe charge.
“The facts and legal precedents compellingly oblige this Court to eliminate the sole aggravating factor from considerations,” state defense attorneys Kathy Nester, Michael Burt, Richard Novak, and Staci Visser in their comprehensive 41-page legal brief.
Following an extensive preliminary hearing conducted over the course of a week in early July, Judge Tony Graf Jr. has allowed both legal teams the opportunity to submit their arguments. His decision on whether there is sufficient probable cause to advance the case to trial is anticipated to be announced on September 1.

Charlie Kirk was addressing an audience at Utah Valley University on September 10, 2025, in Orem, Utah. The founder of Turning Point USA, Kirk was engaging with his audience on the “American Comeback Tour” when the tragic incident occurred, resulting in his death. (Trent Nelson/The Salt Lake Tribune/Getty Images)
Robinson, at age 23, stands accused of fatally shooting the 31-year-old Kirk during a Turning Point USA event at Utah Valley University on September 10, 2025. Kirk, a staunch advocate for conservative values on college campuses nationwide, was addressing an audience of over 2,000 when he was tragically shot in the neck, resulting in his death.
Robinson’s defense argued in Tuesday’s filing that prosecutors didn’t establish probable cause concerning the aggravating factor — that the shooting created a high probability of death to someone other than Kirk and that Robinson knew of that “high probability.”

Tyler Robinson, accused of the murder of Charlie Kirk, appears during a hearing in Fourth District Court in Provo, Utah, Thursday, December, 11, 2025. (Rick Egan/The Salt Lake Tribune via Pool)
Without the aggravator, the potential death penalty would be taken off the table.
“The State had over ten months to investigate the shooting death of Charlie Kirk and to develop legally sufficient evidence that Mr. Robinson ‘knowingly created a great risk of death to another other than Charlie Kirk and the defendant,’ the sole aggravator alleged in the Information which in theory exposes Mr. Robinson to the potential punishment of death,” Robinson’s attorneys wrote. “The State’s presentation of its evidence as to this alleged circumstance in aggravation at the preliminary hearing in July 2026 wholly fails to carry its burden of proof.”
Read the filing:
Robinson’s lawyers noted that there was only one shot fired and that it struck Kirk. No one else was hit.

People run after shots were fired during an appearance by Charlie Kirk at Utah Valley University on September 10, 2025, in Orem, Utah. Kirk, founder of Turning Point USA, was speaking during his “American Comeback Tour” when he was shot in the neck and killed. (Trent Nelson/The Salt Lake Tribune/Getty Images)
They also argued that no one else was in the line of fire — noting that the bullet came from the rooftop, following a downward trajectory before striking Kirk.
“The only evidence presented supports that the bullet travelled above, not through, the crowd,” they wrote.
When the suspected murder weapon was recovered, a .30-06 bolt-action Mauser rifle, there was a spent casing in the chamber and three unfired rounds.

A crowd watches as Charlie Kirk appears at Utah Valley University on September 10, 2025, in Orem, Utah. (Trent Nelson/The Salt Lake Tribune)
And the evidence introduced by Utah County prosecutors indicates Kirk was the lone target, according to the defense filing.
“The communications the State admitted between Mr. Robinson and Mr. Twiggs indicate Mr. Robinson’s intention to kill Charlie Kirk,” the defense wrote, citing an alleged message from Robinson: “I had the opportunity to take out Charlie Kirk and I took it.”

Lance Twiggs, Tyler Robinson’s roommate and reported romantic partner, is shown during a preliminary hearing for Tyler Robinson, who is accused in the fatal shooting of Charlie Kirk, at the Fourth District Courthouse in Provo, Utah, Thursday, July 9, 2026. (Spenser Heaps/AP via Pool)
“There is no mention of any threat or intended harm to any other individual(s).”
Prosecutors have a deadline next week to reply to the brief. Graf’s decision is expected at the Sept. 1 hearing.
Donna Rotunno, a Chicago-based lawyer and Fox News contributor, said Robinson’s argument is a long-shot, especially at the probable cause stage of the case.
“The evidence in the preliminary hearing has already proven that there were many people there,” she told News Media Wednesday. “The evidence has shown where the shooter was vs. where Charlie was and where the shot was taken from, the amount of people who were in the line of fire. They can argue those facts from other pieces of evidence that they’ve introduced. They didn’t need somebody specifically to get on the witness stand and say there were all these people in danger.”

People run after shots were fired during an appearance by Charlie Kirk at Utah Valley University on September 10, 2025, in Orem, Utah. (Trent Nelson/The Salt Lake Tribune)
Prosecutors have alleged that Robinson is the man who appears on surveillance video approaching a sniper’s perch. According to investigators, the killer opened fire from a rooftop on the far side of the packed courtyard, which was full of spectators.
“If you drive a car into a crowd, that whole crowd is in danger,” Rotunno added. “I don’t think that argument is a stretch.”

TPUSA founder Charlie Kirk appears at a Utah Valley University speaking event in Orem, Utah, on September 10, 2025. (Trent Nelson/The Salt Lake Tribune via REUTERS)
Robinson’s lawyers also renewed their attempt to throw out hearsay evidence from the preliminary hearing, arguing that prosecutors haven’t established its reliability.
Similar objections failed in July, and Rotunno said she expects them to fail again.
“They’re relitigating many issues that the judge has already ruled on, and they’re going nowhere,” she said.

An approximation of the suspected movements of Tyler Robinson, Charlie Kirk’s alleged assassin, based on court documents, video from the scene and conversations with law enforcement. (Google Maps, News Media)
The defense is also asking Graf to strike two lesser charges — witness tampering and committing a violent offense in the presence of a child — arguing that Robinson was advising his roommate Lance Twiggs to exercise his constitutional rights and that prosecutors failed to show Robinson knew children were present at the time of the shooting.
And they argue that the enhancement that Kirk was targeted for his political expression should also be dropped, disputing an alleged text from Robinson to Twiggs stating, “I had enough of his hatred.”
“It is the State that argues that because Mr. Robinson and Mr. Twiggs are two men who love each other and/or, it speculates, because Mr. Twiggs (and not Mr. Robinson) was at least intermittently identifying as a female to his close friends, it is Mr. Kirk’s views on these topics which are the ‘hatred’ Mr. Robinson was referring to,” the defense wrote. “These circumstances are not sufficient to establish, even by probable cause which if any political expression of Mr. Kirk motivated Mr. Robinson to select Mr. Kirk for an act of violence.”
Robinson has not yet entered a plea.