Charlie Kirk at Utah Valley University in Orem, Utah, Sept. 10. Investigators are working on finding a motive for the attack and more information may come out once the suspect appears for his initial court hearing.

Prosecutors are preparing to file a capital murder charge Tuesday against the Utah man who authorities say held a “leftist ideology” and may have been “radicalized” online before he was arrested in the assassination of Charlie Kirk.

Charges against 22-year-old Tyler Robinson are expected to come ahead of the first court hearing since he was accused last week of shooting Kirk, a conservative activist credited with energizing the Republican youth movement and helping President Donald Trump win back the White House in 2024.

Investigators have been piecing together evidence, incl

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