The man arrested in the killing of right-wing activist Charlie Kirk is not cooperating with authorities, but investigators are working to establish a motive for the shooting by talking to his friends and family, Utah Governor Spencer Cox said on Sunday.
Cox said the accused gunman, Tyler Robinson, 22, would be formally charged on Tuesday. He remains in custody in Utah.
Investigators have yet to piece together why Robinson allegedly scaled a rooftop at Utah Valley University during an outdoor event and shot Kirk in the neck at long range on Wednesday.
Kirk, a staunch ally of President Donald Trump and co-founder of the conservative student group Turning Point USA, was killed by a single rifle shot during the event attended by 3,000 people in Orem, about 40 miles south (65 km) of Salt Lake City.
The killing ushered in newfound fears of a spike in political violence in the United States and an ever-deepening divide between the left and the right.
Robinson has not confessed to investigators, Cox told the ABC program "This Week."
"He is not cooperating, but all the people around him were cooperating, and I think that's very important," the Republican governor said.
One person who is apparently talking to investigators is Robinson's roommate, Cox said, citing the FBI.
Reuters has not been able to locate the roommate, or representatives for the roommate, to seek comment. Reuters could not determine who is serving as Robinson's legal representative.
Robinson, a third-year student in the electrical apprenticeship program at Dixie Technical College, part of Utah's public university system, was taken into custody at his parents' house, about 260 miles (420 km) southwest of the crime scene after a 33-hour manhunt.
INVESTIGATORS SEARCH FOR MOTIVE
Relatives and a family friend alerted authorities that he had implicated himself in the crime, Cox said previously.
While Robinson was raised by religious parents in a deeply conservative region of the state, "his ideology was very different than his family," Cox said on Sunday on NBC's "Meet the Press" program, without going into specifics.
State records show Robinson was a registered voter but not affiliated with any political party. A relative told investigators that Robinson had grown more political in recent years and had once discussed with another family member their dislike for Kirk and his viewpoints, according to the arrest warrant affidavit.
Robinson was "not a fan" of Kirk's, Cox said on Sunday.
The killing has stirred outrage among Kirk's supporters and condemnation of political violence from some across the ideological spectrum.
Many Republicans, including Trump, have been quick to lash out at the political left, accusing liberals of fomenting anti-conservative vitriol that would encourage a kindred spirit to cross the line into violence - even as the president and his allies have often invoked violent imagery against their opponents.
Mike Johnson, the Republican speaker of the US House of Representatives, urged calm on Sunday.
"We've got to turn the rhetoric down," Johnson said on the "Fox News Sunday" program.
In conversations he has had with Republican and Democratic House members since Kirk's killing, Johnson said, "There's this recognition that people have got to stop framing simple policy disagreements in terms of existential threats to our democracy."
But Johnson also criticized Democrats.
"You can't call the other side fascists and enemies of the state and not understand that there are some deranged people in our society who will take that as cues to act and do crazy and dangerous things. And that's what we've seen in increasing frequency," Johnson said.
On "Meet the Press," Cox assigned some blame to social media, saying it has "played a direct role in every single assassination and assassination attempt that we have seen over the last five, six years."
Trump has credited Kirk with driving young voters to conservatism. His Turning Point movement says it has more than 800 chapters across college campuses. Kirk's widow on Friday said the movement's efforts would go forward.
A memorial event for Kirk will be held on September 21 in Glendale, Arizona, his organization said.
