By Joseph Ax, Rich McKay and Julia Harte

(Reuters) -A day after Utah prosecutors unveiled formal charges against the suspect in the assassination of Charlie Kirk, questions remain about how he planned the shooting, his precise motives for killing the conservative activist and whether anyone else knew what he intended to do.

Prosecutors began outlining the case against 22-year-old Tyler Robinson on Tuesday, when he appeared in court via video feed from jail to face capital murder and other charges. But the charging documents revealed gaps that investigators will likely try to fill in the coming months, experts said.

The details of the killing – and what specifically drove the gunman to carry it out – have taken on outsized importance given the political firestorm surrounding Kirk’s death

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