The widow of prominent right-wing activist Charlie Kirk pledged Friday to carry on her husband’s work, after US authorities announced his alleged assassin had finally been captured.

Erika Kirk vowed in a tearful but defiant video message that “the movement built by my husband will not die” but grow stronger.

Speaking from the studio of his radio-podcast show, she urged young people to join Turning Point, exalting her husband as a fallen political hero who “now and for all eternity will stand at his savior’s side wearing the glorious crown of a martyr.”

She mourned the loss of “the perfect father… the perfect husband.”

The 31-year-old Kirk was hit by a single bullet while addressing a large crowd at Utah Valley University in the town of Orem on Wednesday.

His widow said Friday she had a pointed message for “the evildoers responsible for my husband’s assassination,” although investigators have said they believe the suspect acted alone.

“You have no idea the fire that you have ignited within this wife. The cries of this widow will echo around the world like a battle cry,” she said.

She thanked US President Donald Trump, saying through tears that her husband loved the president, and vowed to keep her husband’s work alive, continuing his campus tour, radio show and podcast.

Investigators had appeared to be making slow progress in the hunt for whoever gunned down Trump’s close ally, until they released security camera images of a young man.

“We got him,” Utah Governor Spencer Cox told a news conference Friday, identifying the suspect as Tyler Robinson, 22, who had reportedly been confronted by his father over the pictures and then turned in.

Kirk was an electrifying presence on the US right, with a huge young following that helped Trump win the election last November.

His murder has consumed America, capturing almost all cable news coverage, while Trump has ordered flags to fly at half-staff.

Kirk’s hardline views on race, gender, gun ownership and other hot-button issues made him an intensely divisive figure, although even opponents praised his willingness to debate.

Details about Robinson began to trickle out Friday, a picture emerging of a young man from a Republican family in St. George, a staunchly conservative city some four hours south of Orem.

“Who would have known that this little skinny guy getting in and out of his car would be able to commit such a heinous act?” Heather McKnight, a former neighbor who had recently moved out, told AFP.

Photographs showed the young man — who was in the third year of an electrician apprenticeship — posing with guns and dressed for Halloween in a costume in which he appears to be riding Trump’s shoulders.

“I always thought he would become a businessman or a CEO someday, rather than what I’m learning about him now,” said Jaida Funk, a 22-year-old who attended elementary and middle school with him.

“It’s definitely unexpected.”

Cox said in an interview with CNN that the suspect was radicalized “in a fairly short amount of time,” without elaborating.

Speculation swirled over markings that Cox said were found on unused bullet casings in the weapon Robinson is believed to have used.

One cartridge had “Hey, fascist! Catch!” written on it, while another featured “Bella ciao,” — a World War II-era Italian anti-fascist song that reports said had recently been repurposed in niche online circles.

Other cartridges were marked with symbols and wording that appeared to be from online gaming culture.

Authorities took 33 hours to make the arrest.

The police and FBI appeared to struggle after detaining, then releasing, two people unconnected to the case.

Investigators then found the alleged murder weapon, a high-powered hunting rifle, in a wooded area near the university and released photos of a young man dressed in a baseball cap and casual clothing.

Late Thursday, officials in Orem released more details about the suspect’s clothing and initial movements after the shooting, pleading with the public to help identify him.

FBI Director Kash Patel said the arrest was finally made at 10:00 pm Thursday.

Cox credited assistance from the alleged killer’s family.

“On the evening of September 11th, a family member of Tyler Robinson reached out to a family friend, who contacted the Washington County sheriff’s office with information that Robinson had confessed to them or implied that he had committed the incident,” he said.

Robinson was being held on suspicion of aggravated murder and was expected to be formally charged in the coming days.

Utah has the death penalty for such crimes — a punishment Trump has said he would like imposed.

Kirk co-founded Turning Point USA in 2012 to drive conservative viewpoints among young people, with his natural showmanship making him a go-to spokesman on television networks.

The father-of-two used his audiences on TikTok, Instagram and YouTube to build support for conservative talking points, and to spread carefully edited clips of his interactions during debates at his many college events.