The F.B.I. on Thursday released two images of a person the agency is seeking in the investigation into the killing of the right-wing activist Charlie Kirk, an indication that efforts to identify the person through facial recognition technology did not work and that officials now need the public’s help.
The grainy images of what the F.B.I. described as a “person of interest in connection with the fatal shooting of Charlie Kirk” show a man wearing a baseball cap, dark sunglasses and a black long-sleeve shirt with an image on it that appears to include, in part, a picture of the American flag.
The second image appears to show the same person walking alongside a wall.
In one of the photographs, the person appears to be walking up a stairwell. The police said earlier that they had video of a person they were seeking who had walked up a stairwell to a rooftop from where the gunshot was fired.
Mr. Kirk was killed by a single gunshot fired from an elevated position as he spoke to a large crowd at an outdoor space on Wednesday, the police said.
Nicholas Bogel-Burroughs reports on national stories across the United States with a focus on criminal justice. He is from upstate New York.
Devlin Barrett covers the Justice Department and the F.B.I. for The Times.
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