New Delhi, Sept. 17 -- Prosecutors have charged 22-year-old Tyler Robinson with aggravated murder in the assassination of conservative activist Charlie Kirk at Utah Valley University, a crime that could carry the death penalty if Robinson is convicted.

Utah County Attorney Jeff Gray announced the charges on Tuesday, calling the killing "an American tragedy." He said Robinson's DNA was found on the trigger of the bolt-action rifle used to fatally shoot Kirk on September 10 as the conservative leader spoke with students.

FBI Director Kash Patel told lawmakers that Robinson's DNA also matched evidence on a towel wrapped around the rifle and a screwdriver left on the rooftop where the fatal shot was fired.

Authorities allege Robinson fired...