Investigator in Charlie Kirk murder case reveals additional engraved casings were found at Tyler Robinson's home, DNA found on screwdriver matches suspect

Agent Dave Hall with the Utah State Bureau of Investigation was called to the stand in the courtroom of Judge Tony Graf on Tuesday. Tyler Robinson's defense attorney's argued for the disqualification of the entire Utah County prosecutors' office in the Charlie Kirk murder case.

Hall took the stand and was first questioned by prosecutors before being cross examined by Kathryn Nester. 

Prosecutors asked Hall to describe the scene where Kirk was killed on the Utah Valley University campus on Sept. 10, 2025 and about evidence collected in the case. Hall describe the "amphitheater" set up of the stage area and noted that there were about 3,000 people in attendance at the TPUSA event that day.

Following Kirk's killing, the Utah State Bureau of Investigation put up posters and issued a general request for witnesses to come forward and give information. 

"There were there were several processes used," Hall said. "There was a general request for information that was put out for people who attended the event. There was a time when people who had attended the event returned to collect personal belongings and posters and requests were made for people to provide information, people who had volunteered information. So several different sources and several different ways that we made contact with the public."

Most of those who came forward, he said, provided similar information. One a few of those witnesses brought forward information that differed from the others in that it was not repetitive. Many videos were collected, as well, and the Bureau was able to obtain more than 40 witness statements, in addition to those gathered by the FBI.

None of those witnesses were able to make a clear identification of the shooter, later identified as Tyler Robinson, who is now facing felony murder charges. 

Hall testified that he was able to obtain "social media chats" which included "admissions that he had been involved in the incident as the shooter."

He was asked if DNA evidence was collected, and Hall said "The evidence that were obtained did provide us with DNA evidence in relation to items used during the commission of the crime, and then they were compared to Mr. Robinson." Hall said that these included "specifically, a screwdriver that was recovered on the rooftop of one of the buildings, and a firearm that was recovered in a tree area on campus."

Once a search warrant was conducted on Robinson's home, further evidence was found. Hall said "there were some bullet casings that had some inscriptions on them. There were some tools that were believed to have been used to make those inscriptions, there were targets, I believe, that had been used, and also targets had been purchased recently or just prior to the event. There was ring doorbell camera footage obtained from other residences down there, and then a number of electrical items, laptops and such that were collected as part of the warrant."

Hall was questioned about the inscriptions on the shell casings that were found in the apartment, and he said they were "relevant because the shell casings recovered with the firearm also had inscriptions on them." He said further that the DNA on the firearm was consistent with that of Robinson. 

These questions from the prosecution were meant to show that the adult child of the prosecutor, who was being used by the defense as a means to try to disqualify the entire prosecutorial team, was far from the only witness and that any witness statement she could have made would have been both repetitive and not dispositive in determining evidence against Robinson.

Kathy Nester, defense attorney for Robinson, addressed Hall in a cross examination. Her concern was that the Bureau had not specifically interviewed the adult child of the prosecutor in question, out of the 3,000 some attendees at the event. Hall emphasized that they took information from those who came forward to provide it.

Nestor went on, asking "And the videos that you got, you understand that these videos have been used far and wide to look to see if there were potentially other shooters in the in the crowd. Have you seen this on social media? Thousands of them."

Hall wasn't sure what she was asking, so she tried again, revealing what is likely to be a core aspect of their defense strategy. "Are you aware that the videos that have been taken from the scene have been analyzed by people on social media and in the press to to see if there was somebody else that could have been involved in this? Are you aware of that?"

"I'm aware that everybody has a theory on the case," Hall said. He noted as questioning went on that the adult child's videos were eventually screened when she later came forward. Some 300 terabytes of video was gathered just from Utah Valley University.

Nester also revisited the concept of DNA evidence, asking Hall "Are you aware that DNA, the DNA evidence that was seized from the scene consisted of a mixture of at least five individuals?"

Hall mentioned that he's not a DNA expert but Nester pressed him on the issue of the five individuals' DNA. She accused Hall of "helping" the prosecutors, saying "so you know enough to say what helps him but you're not going to answer whether or not there were five individuals mixed into that DNA." Nester was not clear as to what DNA she was talking about or where it had been collected or from what objects.