Boeden Seitzinger is reeling from the trauma of witnessing close-up the moment that right-wing activist and U.S. President Donald Trump ally Charlie Kirk was fatally shot in the neck.

"I saw blood just spraying from his carotid artery. It was obvious that he wasn't making it," the electrician, wearing a red Trump campaign cap, said. "It was terrifying."

The killing of Kirk on Wednesday, while speaking at Utah Valley University, highlighted the extreme levels of gun violence in the United States.