WASHINGTON, September 12. /TASS/. The assassination of American conservative activist Charlie Kirk could be the beginning of a "darker chapter" in US history, Utah Governor Spencer Cox said.

"I absolutely believe that this is a watershed in American history," he said as he condemned the heinous act of politically-motivated violence.

"The question is, what kind of watershed and that chapter remains to be written. Is this the end of a dark chapter in our history or the beginning of a darker chapter in our history."