The FBI has released photos of a person of interest in the shooting death of Charlie Kirk.

The FBI's Salt Lake City office shared the photos on social media Thursday.

Kirk, the conservative activist and founder of Turning Point USA, was shot and killed at Utah Valley University Wednesday afternoon during the first stop of his American Comeback Tour.

Kirk was speaking to a crowd of about 3,000 people when a single gunshot was heard and Kirk's head thrust back as he fell, video shows. Kirk had a security detail and there was a small police presence at the event, but there was no security check for people who attended.

President Donald Trump, who was close with Kirk, said Thursday that Kirk will be awarded a posthumous Presidential Medal of Freedom , the nation's highest civilian h

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