The investigation into the suspect accused in the shooting of right-wing activist Charlie Kirk continues, with Utah's Republican Gov. Spencer Cox saying that the person in custody is not cooperating.

Tyler Robinson , 22, is accused of shooting Kirk in the neck during a public appearance at Utah Valley University , Orem, Utah, on Sept. 10.

Cox said on the Sept. 14 edition of ABC News' "This Week" that Robinson was not aiding FBI investigators but that "the people around him are," including a romantic partner with whom he lived.

Cox added that charging documents will detail what authorities believe may have motivated Robinson, as well as forensic evidence linking him to the shooting.

Authorities tied Robinson to the crime through a review of online messages, interviews with his

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