Prominent conservative pundit and media personality Charlie Kirk was shot and killed during a visit to Utah Valley University on Wednesday.
Kirk, who was a supporter of US President Donald Trump, was CEO and co-founder of the conservative youth organization Turning Point USA.
Trump posted on Truth Social after news of the shooting broke that "we must all pray for Charlie Kirk ... a great guy from top to bottom."
Trump later posted on the platform that 31-year-old Kirk had died, after spokesman Andrew Kolvet confirmed the death.
Turning Point USA said in a statement it would be cancelling all events and removing its members from the field until at least next week.
A university spokesperson told NBC News that Kirk was speaking at an event when a single shot was fired, adding he "was hit and taken with his security team away from the premises."
FBI Director Kash Patel and Utah Governor Spencer Cox said a "person of interest" had been taken into custody. That person was later released after questioning.