New Delhi, Sept. 11 -- Charlie Kirk, the 31-year-old CEO and co-founder of conservative youth organization Turning Point USA, was shot and killed on Wednesday (September 10) during an event at Utah Valley University.

President Donald Trump described Kirk as someone who understood "the Heart of the Youth in the United States of America." Trump ordered flags across the US to be flown at half-staff until 6 p.m. ET Sunday.

The fatal incident took place in the Sorensen Center courtyard of Utah Valley University, where Kirk was speaking at a "Prove Me Wrong Table" as part of his national college tour, called The American Comeback Tour.

Videos circulating on social media show Kirk speaking into a handheld microphone when a single shot rang ou...