The Utah trade school student jailed on suspicion of fatally shooting conservative activist Charlie Kirk faces formal charges, according to the governor, from an act of violence widely seen as a foreboding inflection point in US politics.

Tyler Robinson, 22, was arrested on Thursday night after relatives and a family friend alerted authorities that he had implicated himself in the crime, Governor Spencer Cox said on Friday, opening a press conference with the words "we got him".

The arrest capped a 33-hour manhunt for the lone suspect in Wednesday's killing, which President Donald Trump has called a "heinous assassination".

Kirk, co-founder of the conservative student group Turning Point USA and a staunch Trump ally, was gunned down by a single rifle shot fired from a rooftop during an

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