How did Tyler Robinson -- a straight-A student raised Mormon by Republican parents -- become the alleged assassin of right-wing mega-influencer Charlie Kirk?

It's a question that has gripped Washington, the small town in Utah where the suspect grew up.

The 22-year-old arrested late Thursday after a 33-hour manhunt reportedly confessed to killing Kirk, whose popularity among young conservatives helped Donald Trump win the presidential election last November.

Robinson grew up the eldest of three boys in a mid-sized house on a winding street with manicured lawns, in a neighborhood that backs up to a church.

He was "quiet, respectful, kind of stayed to himself. But he was really, really smart," 66-year-old Kris Schwiermann, the retired head custodian at the local primary school, told AFP.

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