Charlie Kirk's alleged shooter not cooperating with authorities, Utah Gov. Cox says

"He has not confessed to authorities. He is not cooperating, but all the people around him are cooperating. And I think that's very important," Cox told ABC's "This Week" host Martha Raddatz.

Raddatz pressed Cox for evidence supporting the claim.

"So far, that has come from his acquaintances and his family members," he said. 

Cox told NBC News on Sunday that Robinson appeared to grow more politically radical after dropping out of Utah State University.

Raddatz asked Cox what needed to happen for this moment to become a turning point in history, referencing his remarks Friday that described the shooting as a watershed moment.

"You know, right now we are in a dark place. Everybody gets that, I think. And we have choices. In my political philosophy and in my religious philosophy, we believe in agency - that every one of us gets to make our own decisions," he said. "Can we do good in our neighborhood? Can we hug a family member? Can we talk to a neighbor we disagree with? That's up to us. That's the only way out. There's nothing else we can do to solve this dark chapter in our history."

Fox News' Anders Hagstrom contributed to this report.