Kirk suspect 'not co-operating' with authorities, governor says.
Speaking to ABC News , Cox, a Republican, said people around Mr Robinson had been co-operating with the investigation.
Suspect Tyler Robinson, 22, was taken into custody some 33 hours after Kirk, a 31-year-old right-wing activist, was shot dead in Orem on Wednesday.
Charlie Kirk's alleged killer is "not co-operating" with authorities and has not confessed to carrying out the shooting, Utah's governor Spencer Cox has told US media.
Kirk was speaking at Utah Valley University at an open-air event held by Turning Point USA - the organisation he co-founded - when he was shot and killed.
The governor said among those co-operating with authorities is Mr Robinson's roommate, who he said was also his partner.
"We're interviewing all kinds of people - everyone that knows him - and trying to learn more about what the motive actually was," Cox said. »