WASHINGTON — Charlie Kirk’s alleged shooter Tyler Robinson was living with a transgender partner who was in the process of transitioning from a male to a female, a law enforcement source confirmed to The Post Saturday.
That individual, who has yet to be identified by the authorities, is now fully cooperating with the FBI on its investigation into the fatal shooting of the conservative activist, the source added. The relationship was first reported by Fox News’ Brooke Singman.
Text messages and other communications that the transgender individual traded with Robinson, 22, helped the feds nab the accused assassin.
Mugshot of alleged assassin Tyler Robinson. via REUTERS
Federal and state authorities revealed during a Friday news conference that a roommate was cooperating with their investigation.
The roommate had shared communications from a contact named “Tyler” on Discord that described bullet casings similar to those found at the scene and discussed the “need to retrieve a rifle from a drop point.“
Police vehicles seen at the apartment complex where Tyler Robinson lives. AFP via Getty Images
The messages provided evidence for authorities to seek an aggravated murder charge against Robinson on Friday — the only one that carries the death penalty.
Robinson allegedly shot and killed conservative activist Charlie Kirk on Wednesday, Sept. 10, 2025, during Kirk’s stop at Utah Valley University for his American Comeback Tour. Amber Jones Robinson / Facebook
Kirk, 31, was struck in the neck by a single bullet shortly after being posed a question on his “American Comeback” college speaking tour about transgender mass shooters.
Stay up to date on the shooting of conservative activist Charlie Kirk
“Do you know how many transgender Americans have been mass shooters over the last 10 years?” asked attendee Hunter Kozak.
“Too many,” Kirk responded.
Robinson (pictured) struck Kirk in the neck by a single bullet shortly after being posed a question on his “American Comeback” college speaking tour about transgender mass shooters. amber.j.robinson/facebook
“Do you know how many mass shooters there have been in America over the last 10 years?” Kozak followed up.
“Counting or not counting gang violence?” the Turning Point USA founder sought to clarify.
UVU mathematics student Hunter Kozak (pictured), who debated Charlie Kirk seconds before the activist was assassinated, spoke out over the shooting on Friday. hunter /X
Kirk was shot immediately after and transported to a hospital where he underwent surgery. He was later pronounced dead.
“People have obviously pointed out the irony that I was — that the point I’m trying to make is how peaceful the left was right before he got shot,” Kozak said in a clip posted Thursday on social media. “And that only makes sense if we stay peaceful.”
Kirk was shot immediately after answering a follow-up question from Kozak at the UVU event on Sept. 10, 2025. via REUTERS
Though he grew up in a largely conservative Mormon family, Robinson was not registered with either major political party and appeared to have become infatuated by the far left in recent years, according to the authorities.
Robinson grew up in a largely conservative Mormon family, though he was not registered with either major political party. Facebook / Amber Jones Robinson
“It’s very clear to us and to the investigators that this was a person who was deeply indoctrinated with leftist ideology,” Utah Gov. Spencer Cox told The Wall Street Journal in a brief interview published Friday.
Cox also revealed that a recent family dinner had showcased Robinson’s newfound beliefs, as he and a relative got into it over Kirk’s viewpoints and how each “didn’t like” the 31-year-old conservative activist.
Supporters and fans left flowers at the vigil site for Charlie Kirk following the shooting at UVU. Bob Strong/UPI/Shutterstock
Robinson also discussed in messages with the roommate how he allegedly etched messages onto bullets.
Casings found at Utah Valley University where Kirk was shot bore inscriptions, with one stating, ”Hey fascist! catch!”
The bullets were fired from an imported .30-06-caliber Mauser bolt-action rifle that investigators found wrapped in a towel in a wooded area.
“Messages from contact Tyler also mention that he had changed outfits,” according to Robinson’s affidavit that detailed the Discord discussions.
Vice President JD Vance personally escorted Kirk’s remains onto Air Force 2 to the conservative activist’s home in Arizona. X/@tylerbowyer
The social networking platform said in a statement Friday that there was “no evidence that the suspect planned this incident or promoted violence on Discord.”
“The messages referenced in recent reporting about planning details do not appear to be Discord messages,” the company added.
“These were communications between the suspect’s roommate and a friend after the shooting, where the roommate was recounting the contents of a note the suspect had left elsewhere.
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“We have removed the suspect’s account for violating our off-platform behavior policy.”
Robinson turned himself in to the authorities after speaking with a youth minister and being confronted by his own father, a former sheriff’s deputy, about the shooting, law enforcement sources said.
The FBI did not immediately respond to a request for comment.