President Donald Trump, a close ally of Kirk, mourned his death publicly, praising him as a “legendary” figure and “advocate of non-violence.” He spoke with Kirk’s widow, Erika Frantzve, and later announced that Kirk would receive the Presidential Medal of Freedom posthumously. Trump also confirmed that a suspect was in custody, reportedly turned in by someone close to them, though no official charges had been announced at the time.

The FBI and local law enforcement launched a multi-agency investigation. Surveillance footage showed the shooter fleeing the rooftop immediately after the attack. The FBI released photos and video of a person of interest and offered a $100,000 reward for information. Forensic evidence collected included shoe prints, a palm print, and the suspected murder weapon—a high-powered bolt-action rifle found in a nearby wooded area.

Initial confusion followed the incident, with conspiracy theories emerging online. Some speculated about the presence of Trump’s Secret Service agents at the event, but this was debunked when it was clarified that the man in question was Kirk’s longtime personal security.