WASHINGTON — Charlie Kirk’s alleged ass@ssin Tyler Robinson was living with a tr@nsgender partner who was in the process of tr@nsitioning from male to female, a law enforcement source confirmed to The Post Saturday.

That individual, who has yet to be publicly identified by the authorities, is now fully cooperating with the FBI on its investigation into the fatal sh:00ting of the conservative activist, the source added. The relationship was first reported by Fox News’ Brooke Singman.

According to public records, Lance Twiggs, 22, resided at the same address where Robinson lived. A relative of Twiggs confirmed to The Post Saturday that “yes, they were roommates.”

Mugshot of Tyler Robinson, suspect in Charlie Kirk shooting.
Mugsh:0t of alleged ass@ssin Tyler Robinson.via REUTERS

Photo of Lance Twiggs, Tyler Robinson’s roommate, wearing a lavender sweatshirt and black pants.
According to public records, 22-year-old Lance Twiggs (pictured) resided at the same address where Robinson lived.Lance Twiggs/ TikTok

Close-up of Lance Twiggs, Tyler Robinson's roommate, wearing a headset and hat, holding a piece of food in his mouth.
A relative of Twiggs confirmed to The Post Saturday that “yes, they were roommates.”Lance Twiggs/ TikTok
The family member, who asked not to be identified, said Twiggs was the “black sheep” of their St. George, Utah, family, but declined to speculate on a romantic relationship between the two men.

She said she didn’t know her relative’s politics or whether Twiggs was tr@nsitioning to become a woman, but added that it wouldn’t surprise her.

The family member said she knew Twiggs was brought in for questioning by police. The Post observed Saturday that no one was at the $1,800-per-month townhouse Robinson and Twiggs were believed to have shared.

Close-up of Lance Twiggs wearing a yellow hat.
Twiggs’ family member, who asked not to be identified, declined to speculate on a romantic relationship between Twiggs and Robinson.Lance Twiggs/ TikTok
A neighbor claimed two weeks ago several people, driving cars with out of state plates, were seen going in and out. “They did not give off a good vibe,” the neighbor said.

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 tr@nsgender mass sh:00ters.

“Do you know how many tr@nsgender Americans have been mass sh:00ters over the last 10 years?” asked attendee Hunter Kozak.

Person snowboarding on a mountain with a scenic view.
According to family members, Twiggs was already brought in for questioning by the police.Lance Twiggs/ Facebook

Police vehicle at the apartment complex of Tyler Robinson, suspected of killing Charlie Kirk.
Police vehicles seen at the apartment complex where Tyler Robinson lives.AFP via Getty Images
“Too many,” Kirk responded.

“Do you know how many mass sh:00ters 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.

Photo of Lance Twiggs wearing a dog-hooded onesie.
The family member also said she didn’t know her relative Twiggs’ politics or whether he was tr@nsitioning to become a woman.Lance Twiggs/ TikTok

Photo of Tyler Robinson.
Robinson allegedly sh:0t 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

Photo of Tyler Robinson with his mother, Amber Robinson. Possible suspect in the assassination of Charlie Kirk.
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 tr@nsgender mass sh:00ters.amber.j.robinson/facebook
Kirk was sh:0t immediately after.

As a self-professed evangelical Christian, Kirk criticized the goals of the “LGBTQ agenda,” expressed opposition to same-sex marriages and spoke out against gender-reassignment surgeries and procedures. But he usually spoke about these issues with kindness and empathy.

Tyler Robinson, 22, eating breakfast.
Robinson grew up in a largely conservative Mormon family, though he was not registered with either major political party.Facebook / Amber Jones Robinson
He recently spoke at length to a tr@nsgender male about the process of tr@nsitioning at one of his “Prove Me Wrong” pop-up, question-and-answer events, according to a video of the encounter posted by his organization in May.

The UVU mathematics student who debated Charlie Kirk seconds before the activist was assassinated spoke out over the shooting on Friday.
UVU mathematics student Hunter Kozak (pictured), who debated Charlie Kirk seconds before the activist was ass@ssinated, spoke out over the sh:00ting on Friday.hunter /X

Charlie Kirk speaking at a Utah Valley University event.
Kirk was sh:0t immediately after answering a follow-up question from Kozak at the UVU event on Sept. 10, 2025.via REUTERS
“I want you to be very cautious putting drugs into your system in the pursuit of changing your body,” he said. “I, instead, encourage you to work on what’s going on in your brain first.

“I think what you need first and foremost is just a diagnosis,” he went on. “Just someone that is going to listen to what you have gone through, listen to what else is going on.”

“My prayer for you,” he added, “I actually want to see you be comfortable in how you were born.

Photo of a family; a woman, a man, and three children, two of whom have their faces blurred.
Though raised in a conservative Mormon household, Robinson seemingly had become infatuated with left-wing ideology in recent years.Amber Robinson/ Facebook
“Yeah,” his questioner agreed.

“I know that you might not feel that way, but I think that is something that you can achieve,” Kirk concluded. “I think that with the right team and the right people you don’t have to wage war on your body, you can learn to love your body.”

The FBI is currently looking for a possible motive in “a mountain of evidence” which includes the relationship between Robinson and Twiggs as well as “every connection, every group, every link and anyone tied” to the sh:00ting, according to the law enforcement source.

Teenager sitting near a machine gun.
In this picture pulled from his mother’s Facebook, Tyler Robinson is seen with playing with a machine g::un.amber.j.robinson.1/Facebook
Federal and state authorities revealed during a Friday news conference that a roommate was cooperating with their investigation. Text messages and other communications that the roommate traded with Robinson, 22, helped the feds nab the accused ass@ssin.

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.“

Casings found at Utah Valley University where Kirk was sh:0t bore inscriptions, with one stating, ”Hey fascist! catch!” The bullets were f!red  roughly 200 yards 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 an affidavit that detailed the Discord discussions.

Photo of Tyler Robinson and his father, Matt Robinson.
Communications that the roommate traded with Robinson helped authorities catch the alleged ass@ssin.
The messages provided evidence for authorities to seek an aggravated murder charge against Robinson on Friday — the only one that carries the d3ath penalty.

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.

“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.

Memorial with flowers, flags, and messages for Charlie Kirk.
Supporters and fans left flowers at the vigil site for Charlie Kirk following the sh:00ting at UVU.Bob Strong/UPI/Shutterstock
Robinson also discussed in messages with the roommate how he allegedly etched messages onto bullets.

A former co-worker from Wilde Electric told The Post Saturday that Robinson once boasted about his marksmanship and having hit a “450-yard sh:0t.”

The family member said as a child that Twiggs was seen as “intelligent,” a “fast talker” and a “talented pianist.”

“But when he got older he was always gaming and in his own little world,” the relative noted. “He is still somewhat involved with the family but has chosen a very different lifestyle so not super close. He moved out when he was 17.”

Drone view of rooftop showing the reported location of a shooter.
Signs of indented prints allegedly left behind on the rooftop of the building where accused ass@ssin Tyler Robinson took his sh:0t that killed Kirk.REUTERS

“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 sh:00ting, where the roommate was recounting the contents of a note the suspect had left elsewhere.

A casket is carried by US Air Force pallbearers, while a grieving woman waves goodbye.
Vice President JD Vance personally escorted Kirk’s remains onto Air Force 2 to the conservative activist’s home in Arizona.X/@tylerbowyer
“We have removed the suspect’s account for violating our off-platform behavior policy.”

Robinson turned himself in to the authorities after being confronted by his own father and speaking with a youth minister about the sh:00ting, law enforcement sources said.

Neighbors had left a small bouquet of white flowers at the Robinson family home in Saint George on Saturday.

The FBI and Washington County, Utah, Sheriff’s Office did not immediately respond to a request for comment.