Federal agents have widened their investigation into the Sept. 10 assassination of conservative activist Charlie Kirk to examine whether online pro‑trans groups and Utah‑based organizations had prior knowledge of the plot, according to people familiar with the probe.
Investigators are looking at activity in online communities, including the gaming platform Steam, and at local groups such as Armed Queers SLC as they try to determine whether Tyler Robinson, who was arrested at the scene, acted independently or had advance warning or assistance. Robinson has been charged in the fatal shooting of Kirk at a public event at Utah Valley University.
Federal and local law enforcement sources told reporters that the inquiry includes scrutiny of online posts and private messages that, while not yet verified, appear to show people celebrating or hinting that something would happen around the time Kirk was scheduled to speak. Investigators are compiling a timeline of social‑media activity to assess whether those posts provide credible leads or were merely opportunistic reactions to the killing.
Some archived posts circulating online show users making ominous statements the day before the shooting, including language saying it would be a "bad day" for Kirk and implying a planned action. Other accounts allegedly posted after the shooting asserting they had not been involved. Law‑enforcement officials have cautioned that social‑media archives can be altered or misattributed and that those posts are part of a wider digital trail investigators are tracing.
Officials are also examining the activities and materials of Armed Queers SLC, a self‑described pro‑trans organization based in Salt Lake City whose Instagram page was taken down after the shooting. Flyers obtained by investigators show that the group, which partnered with a student organization at the University of Utah for a September 2023 event, used imagery of ammunition and included slogans such as "agitate, educate, organize." A representative for the group told Voyage Utah last year that the organization embraced what it described as a commitment to struggles against racism, transphobia and capitalism that could involve risk‑taking.
Utah Gov. Spencer Cox said investigators were also exploring whether aspects of Robinson's personal life might have provided a motive. Cox told CNN's State of the Union that Robinson had been in a relationship with a partner who is transgender and that the partner, named in news reports as Lance Twiggs, has been cooperating with investigators. The governor said Twiggs has not been accused of involvement and that officials believe he had "no idea this was happening."
Cox also told the Wall Street Journal that investigators had concluded Robinson had been "deeply indoctrinated with leftist ideology," an assessment reportedly based in part on conversations between investigators and Robinson's family. Media reports have said Robinson expressed interest in fringe internet culture and radical politics, but investigators have not publicly disclosed definitive evidence linking any organization to planning or facilitating the attack.
Federal authorities have declined to comment on whether specific groups are under investigation. The Utah Department of Public Safety did not respond to a request for comment, and representatives of Armed Queers SLC could not be reached.
Prosecutors and federal agents have said they are treating the case as both a homicide investigation and a potential domestic terrorism matter while they build evidence about motive, planning and any possible coordination. Officials have urged caution about drawing conclusions from unverified online posts and emphasized that social‑media activity alone does not establish criminal involvement.
Kirk, 31, founder of Turning Point USA and a prominent conservative commentator, was shot as he answered a question about mass shootings at the university event. Authorities arrested Robinson at the venue and allege he fired at Kirk from close range. Investigators continue to interview witnesses, review video, and subpoena records from social platforms as they seek to reconstruct the events leading up to the killing and to determine whether others were involved.
The widening of the probe comes amid intense online attention and competing narratives about motive and responsibility. Law‑enforcement officials said the work of sifting through digital evidence is time‑consuming and that public disclosures will follow if investigators develop provable links to individuals or organizations. For now, authorities have emphasized that their investigation remains active and that any assertions about group coordination are subject to verification through criminal process.