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This photo released by the Utah Governor's Office on Friday, Sept. 12, 2025 shows Tyler Robinson. (Utah Governor's Office via AP)

PROVO, Utah – 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, including a rifle and ammunition engraved with anti-fascist

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