Charlie Kirk, the 31-year-old founder of conservative group Turning Point USA, was shot and killed during a campus appearance in Orem, Utah, on Wednesday, authorities said. Police on Friday identified the suspected shooter as 22-year-old Tyler Robinson, who was arrested after a 33-hour manhunt that ended with a tip from a relative, officials said.

Witness video and officials said Kirk was struck by a single high-powered rifle round to the neck while speaking to a packed audience and died on stage. The shooting occurred shortly after Kirk offered remarks praising the Church of Jesus Christ of Latter-day Saints and bantered with a man in the crowd about the church's missionary uniforms.

Authorities said the suspected shooter fired from outside the venue using a scoped hunting rifle and later discarded the weapon in a wooded area near campus. Investigators recovered the firearm and found two unused bullet casings nearby that bore hand-etched inscriptions, including one that read, "Hey, fascist! Catch!" Governor Spencer Cox said forensic analysis was ongoing to determine whether Robinson acted alone or had been influenced by extremist online communities.

"We do not yet have definitive proof of political motivation," Cox said at a news conference, calling the markings on the casings "deeply troubling." He said a family member of Robinson contacted a family friend on the evening of Sept. 11, who then alerted the Washington County sheriff's office, leading to the arrest. FBI Director Kash Patel confirmed that the arrest took place around 10 p.m. Thursday.

Robinson, described by officials as a trade school student in the third year of an electrician apprenticeship, was raised in a devout Mormon household, the Salt Lake City-area community told reporters. Church leaders and members quickly condemned the violence. A spokesman for the Church of Jesus Christ of Latter-day Saints said it "condemns violence and lawless behavior" and urged members to "treat one another with greater kindness, compassion and goodness."

Early in the investigation, the FBI said it briefly detained two unrelated individuals before focusing on Robinson. Officials have released limited information about motive and cautioned that the probe remained active. Cox said investigators were reviewing social media and other digital evidence, and that forensic testing would continue.

Kirk, who co-founded Turning Point USA in 2012 and rose to prominence as a forceful voice in conservative youth politics, had frequently drawn attention for his outspoken views on race, immigration, guns, gender identity and religion. At the event, footage posted on social media captured him praising what he called the Mormon ethos of service and evangelism: "I love how Mormons send missionaries around the world, I love how polite they are. … Half my team is Mormon — Mormons are great people," he told the crowd.

National political figures reacted within hours. Former President Donald Trump ordered flags at federal buildings flown at half-staff and publicly called for swift justice, saying he wanted the death penalty for the killer. Vice President J.D. Vance accompanied Kirk's casket on the return flight to Phoenix and was recorded placing his hand on the flag-draped coffin as it was carried off the plane.

Hundreds gathered at a vigil in Orem Park on Thursday evening, where supporters held candles and political apparel as they remembered Kirk. "It still feels insane that this happened," Jonathan Silva, 35, told reporters at the vigil.

Authorities said photos circulating on social media showed Robinson in a Halloween costume intended to depict him riding on the shoulders of former President Trump and in other images posing with firearms, but officials stressed those images were part of the ongoing inquiry. Local acquaintances described Robinson as quiet and raised in the church Kirk had praised; a former school custodian told media she had known him as a polite student and was shocked by the allegation.

Law enforcement agencies, including the FBI, continued to investigate the circumstances of the shooting, the origin of the weapon and any potential ties to extremist groups or online communities. Officials urged anyone with information to come forward as they worked to establish a full timeline and motive.

The slaying of a high-profile conservative organizer at a public campus event intensified national attention on political violence and the security of public figures, prompting renewed scrutiny from lawmakers and law enforcement officials. Investigators said they would provide further updates as evidence developed and as forensic testing was completed.