President Donald Trump on Friday said that a suspect in the Charlie Kirk assassination had been captured, ending a tense two-day manhunt after the FBI had circulated video and images of the suspect but withheld his name.Jason Pack, a retired FBI supervisory special agent, told Fox News Digital that the strategy was intentional designed to protect both the investigation and public safety and it mirrored the 2013 Boston Marathon bombing probe.Pack said withholding the suspects identity can help generate stronger public tips by focusing attention on confirmed images rather than unverified names."You need biometrics, records and independent confirmation before you hang a name on a suspect. That protects the public and the case," Pack said. "Same playbook we used in Boston. Show the public what you are certain about to trigger quality tips and hold what is not yet courtroom-ready."ARREST MADE IN CHARLIE KIRK ASSASSINATION AT UTAH UNIVERSITY EVENTPack said withholding a name is crucial until investigators have a positive ID that meets a prosecutable threshold and until all notification steps are handled.The FBI also withheld names during the Boston Marathon bombing investigation, when the Tsarnaev brothers were first known through images, and in the 2020 Nashville Christmas Day bombing, when DNA testing was used to confirm the suspect's identity before authorities made an announcement."In Nashville, we had the persons ID and suspected who he was a couple of days before," Pack said. "But we wanted to make sure through DNA and forensic testing that it was the person and not someone whose wallet had been stolen. So we had to wait for confirmation at least initially."Authorities said Kirks killer wore Converse sneakers, which drew widespread attention in surveillance footage.COMPLETE COVERAGE OF CHARLIE KIRK"Footwear alone does not define tradecraft," Pack said. "Some offenders choose non-tactical shoes to blend on sidewalks, move quietly, or to misdirect. It could be comfort, availability, or deliberate disguise. Investigators will weigh gait, wear patterns and outsole marks against any scene impressions, not just the brand."A $100,000 reward for information on the killer was announced as law enforcement sought the publics help.Pack explained that reward figures are not set according to a rigid formula they are adjusted depending on the level of threat to the community, the urgency of the case and the funding available from law enforcement and partner agencies.In this case, with a gunman at large after a high-profile political assassination, officials opted for a high figure up front to generate leads quickly, he said."There was a lot of pressure on law enforcement," Pack said. "They wanted to get it right."