Former Utah congressman Jason Chaffetz, who was at the event with his family, told Fox News that the shot came during the second question Kirk was answering about transgender shooters. [...] He told the outlet he believed it was “no coincidence” Kirk was shot during the question about transgender mass shootings[.]

I will take an expansive definition of "transgender" for this question, including nonbinary people and anyone else who's significantly gender non-conforming. ("Significant" is a relevant word here; JD Vance doesn't count just because he wears eyeliner.) Whether they identify with the word "transgender" is irrelevant.