Earlier Thursday, the FBI released photos of the "person of interest," describing him as a college-aged man dressed entirely in black.
Several people in the US, including school teachers, firefighters, officials, and media personalities, are under investigation for commenting on the assassination of Charlie Kirk.
Yordanis Cobos-Martinez, 37, is a Cuban resident released from ICE custody in January after Cuba refused to accept him over his criminal record.
The Somali-American refugee turned lawmaker blamed the TurningPoint USA founder for escalating violence.
Christine Paige Cockrell, a 54-year-old teacher Gatesville Junior High, was sentenced to serve eight years of probation and was ordered to give up her teaching license.
The footage shows the suspected gunman dressed in all black, sprinting across the roof of a campus building.
While most of the crowd dropped to the ground after the gunshot, one man, long-haired, bearded, and still unidentified, stayed on his feet.
Authorities are urging anyone who recognizes the man to contact the FBI at 1-800-CALL-FBI or send in a tip online.
In the photos, the man can be seen wearing wraparound sunglasses, a dark hat, and a long-sleeve shirt that seems to feature an American flag design.
The nearby regional airport, which handles domestic flights, is just a ten-minute drive from Utah Valley University, where Kirk had been speaking.
Kirk was shot dead on stage on Wednesday afternoon while leading a Q&A session during his American Comeback Tour at Utah Valley University in Orem.
During the segment, he even speculated — in a bizarre suggestion — that a supporter might have accidentally killed Kirk by firing a gun in "celebration."
Charlie Kirk was shot and killed while at Utah Valley University for a public event. Witnesses said panic broke out as he fell to the ground with a neck wound.
Alexa Wingerter pleaded guilty to two counts of prohibited sexual contact between an educator and student. As part of her plea deal, she will avoid jail time and will only have to register as a sex offender.
Chelsea Perkins, 35, was sentenced to 22 and a half years over the murder of 31-year-old Matthew Dunmire in March 2021.