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Tyler Robinson, 22, is accused of killing Charlie Kirk during a rally at Utah Valley University

Robinson's alleged motive has been the subject of speculation

Utah Gov. Spencer Cox claimed the suspect had a "leftist ideology," but did not provide further details

Authorities investigating the assassination of Charlie Kirk are trying to pin down the suspected shooter's motive, which has been the subject of fervent online debate.

Kirk, a right-wing activist, was fatally shot at a Turning Point USA rally at Utah Valley University in Orem, Utah, on Wednesday, Sept. 10.

Authorities say the gunman used a high-powered rifle to shoot Kirk from the roof of a building 200 yards away from where the event was being held.

On Friday, Sept. 12, authorities arrested Tyler Robinson ,

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