Authorities are continuing their search for an unidentified shooter in the murder of Charlie Kirk.

The FBI released a photo of a person of interest Thursday. The agency is also offering a $100,000 reward for information leading to an arrest.

RELATED: Charlie Kirk shooting: Person of interest photos released by FBI

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

Here's the latest:

President Trump comments

5:20 p.m.: President Donald Trump briefly answered reporters' questions as he left the White House for New York. He said he has his own thoughts about the killer's motivation but declined to elaborate, deferring instead to the investigation.

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