(NEXSTAR) – Charlie Kirk, a longtime ally of President Donald Trump and the co-founder of conservative youth organization Turning Point USA, was fatally shot Wednesday during a college event in Orem, Utah.

A video that circulated on social media shows Kirk, sitting with a microphone in hand under a tent with the slogan "Prove Me Wrong," speaking to a large audience when a single shot can be heard. Kirk reaches up with his right hand as blood shoots from the left side of his neck. He was rushed into a nearby vehicle, video showed, and taken to the hospital in critical condition.

At a 3:30 p.m. MT news conference, authorities announced that they had a person of interest in custody, but that the investigation was ongoing.

Later in the afternoon President Trump announced that Kirk had died,

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