DNA on a towel wrapped around the suspected gun used to kill Charlie Kirk has been matched to the suspect in custody, the director of the FBI said on Monday.

Tyler Robinson, 22, was arrested over the death of the right-wing influencer at an event at Utah Valley University. A bolt-action rifle was recovered near the shooting, and a screwdriver was found on the roof from where the fatal shot was fired.

I can report today that the DNA hits from the towel that was wrapped around the firearm and the DNA on the screwdriver are positively processed for the suspect in custody, Kash Patel told Fox and Friends.

A formal charge is expected this week. A motive has yet to be determined.

The FBI director mentioned a note discovered at the suspect's home, which vowed to take out Kirk. Patel stated the note was written before the shooting, and despite being destroyed, forensic evidence was found.

Investigators are also examining Robinson's social media accounts and any suspected accomplices.

Robinson is accused of aggravated murder, obstruction of justice, and felony discharge of a firearm.

Utah Governor Spencer Cox reported that Robinson, persuaded to surrender by his father, had been uncooperative with investigators and had not confessed to the shooting.

Vice-President JD Vance hosted a tribute episode of Kirk's daily podcast, condemning anyone celebrating Kirk's death and vowing to dismantle violent extremist networks in the US. Kirk, a founding member of Turning Point USA, had recently been engaging with college students across the country.