The FBI and officials have released new video and images of a "person of interest" in connection with the shooting of conservative activist Charlie Kirk, as the manhunt continues.
At a news conference on Friday, Utah Governor Spencer Cox showed video footage of the suspect walking on the roof of the building from where the fatal shot was fired. He is then seen climbing down and heading toward a wooded area, where police say he abandoned his rifle.
Additional images released by police show the suspect wearing a hat, sunglasses, and a backpack.
Investigators have conducted nearly 200 interviews related to the case as 20 law enforcement partners are working on the investigation, Governor Cox said.
Prosecutors will seek the death penalty against the attacker, he said.
Follow the latest updates on Charlie Kirk's killing
Earlier, authorities said the shooter was thought to have jumped off a roof and fled into a neighbourhood after firing one shot.
They also said the suspect was a male who "appears to be of college age" and blended in on the Utah Valley University campus in Orem, where Mr Kirk was killed.
Mr Kirk, a 31-year-old right-wing influencer, was fatally shot in the neck on Wednesday afternoon while speaking to university students at an event. He died in hospital after being shot.
The rifle suspected of being used in the shooting has been found.
In a briefing on Thursday, FBI agent Robert Bohls said: "I can tell you that we have recovered what we believe is the weapon that was used in yesterday's shooting... is a high-powered bolt action rifle.
"That rifle was recovered in a wooded area where the shooter had fled. The FBI laboratory will be analysing this weapon."
Investigators have collected a footwear impression, a palm print, and forearm imprints for analysis.
Read more:
Who was Charlie Kirk?
Moment gunshot heard at university event - Watch
The father-of-two was the chief executive and co-founder of Turning Point USA, a prominent organisation that engages conservative youth on school campuses.
He had millions of followers across social media.
Mr Kirk and Turning Point USA played a key role in driving youth support for Mr Trump in last November's presidential election. His events at college campuses nationwide typically drew large crowds.
Many people listened both in person and online to Mr Kirk, as he advocated for conservatism among younger generations and became a leading voice in the Make America Great Again (MAGA) movement.
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President Donald Trump paid tribute to Mr Kirk while on stage at a 9/11 memorial event in Virginia, saying he would be awarding him the Presidential Medal of Freedom.
"Before we begin, let me express the horror and grief so many Americans at the heinous assassination of Charlie Kirk have felt," Mr Trump said.
"Charlie was a giant of his generation, a champion of liberty and an inspiration to millions and millions of people. Our prayers are with his wonderful wife, Erika, and his beautiful children."
He later added the FBI was making "big progress" in finding the shooter and he has "an indication" of the motive, but declined to expand.
"He's an animal, total animal, hopefully they'll have him and they'll get him."
Mr Kirk's body was flown back from Salt Lake City to his home state of Arizona on Air Force Two on Thursday, with the vice president and close friend JD Vance on board.
Mr Trump said he plans to attend Mr Kirk's funeral, although no date has yet been set.
(c) Sky News 2025: FBI releases video of Charlie Kirk shooting suspect on roof of building before he vanished