Charlie Kirk, the founder of the conservative youth group Turning Point USA, was shot and killed Wednesday while appearing at an event on the campus of Utah Valley University in Orem, Utah, authorities and the organization said.

Kirk, 31, was speaking to a crowd of students on the second stop of Turning Point’s “America Comeback Tour” when the shooting occurred midday. The gathering drew hundreds of attendees, Turning Point said. Law enforcement officials opened an investigation into the incident; no motive had been released as of Thursday morning.

The shooting drew swift national attention and rare bipartisan expressions of shock in a country that has seen several recent episodes of politically charged violence. The attack on Kirk came two days after the start of the trial of a man charged with attempting to assassinate former President Donald Trump and months after separate attempts on the former president’s life in Butler, Pennsylvania, and West Palm Beach, Florida.

Turning Point USA said Kirk had been the center of the tour and a leading public face for a movement that he helped build from a campus-focused organization into a large political operation. Born and raised in a Chicago suburb, Kirk said he was an Eagle Scout and at 18 co-founded Turning Point in 2012 with mentor Bill Montgomery after leaving community college. Over the following decade, the organization expanded into a multimillion-dollar network of campus chapters, conferences and media operations.

Public filings show Turning Point’s affiliated nonprofit and political-action entities reported combined revenues of $4.3 million in 2016 and had grown to roughly $92.4 million by 2023. Supporters who helped finance that growth included conservative donors such as Foster Friess and foundations connected to Home Depot co-founder Bernard Marcus and members of the DeVos family. Ginni Thomas, the wife of Supreme Court Justice Clarence Thomas, served on a Turning Point board.

Kirk parlayed the group’s campus presence into a broader media and political profile. He published several books, launched a popular podcast and built a YouTube audience that the organization cites in the millions. He became a frequent presence at Republican events and cultivated ties to former President Trump, who often amplified Kirk’s commentary and invited him to White House and Mar-a-Lago events. Supporters and some Republican officials credited him with helping to mobilize young voters for Trump’s 2024 campaign.

Kirk’s commentary and activism were frequently controversial. He championed conservative Christian values, opposed diversity, equity and inclusion programs on campuses, and pushed hardline positions on immigration and cultural issues. He drew criticism from critics across the political spectrum for provocative rhetoric; he also retained a large base of followers who viewed him as an effective organizer for conservative causes.

In recent months, Kirk was a frequent media presence. In March, he appeared as the first guest on California Gov. Gavin Newsom’s podcast in a widely circulated interview that featured pointed exchanges on transgender athletes and other cultural issues. On his social media account X, where he regularly commented on news events, his final post called for politicizing the fatal stabbing of a Ukrainian refugee in Charlotte, contending that politics had allowed a repeat offender to remain free on the streets.

Kirk’s rise began after a pivotal rejection from West Point and a move into conservative activism. He wrote opinion pieces for right-leaning outlets, dropped out of Harper College, and, with the backing of early donors, expanded Turning Point from a campus organization into a national operation. Turning Point’s activities included on-campus chapters, annual conferences, training programs for student activists and a wide array of online content.

Family and longtime associates described Kirk as a committed family man and activist. He married Erica Frantzve Kirk in May 2021; she is a former beauty pageant contestant. The couple had two young children, a three-year-old daughter and a 16-month-old son. Friends and donors have credited Kirk with an outsized role in mobilizing conservative youth and shaping the messaging of a new generation of activists.

Kirk’s relationships with Republican figures were visible at high-profile political events. Supporters pointed to his access at the presidential inauguration and other gatherings as evidence of his influence. Critics said his arguments and tactics intensified partisan rhetoric and contributed to a polarized campus environment.

Authorities said their investigation was ongoing and provided few immediate details about the shooter or the circumstances. Local law enforcement, state police and federal authorities have previously worked together in high-profile politically motivated attacks; officials did not say whether federal agencies had joined the inquiry into Wednesday’s shooting.

The attack revived concerns about the rise in political violence in recent years and prompted calls for calm from leaders on both sides of the political aisle. Lawmakers and commentators urged authorities to complete the investigation and warned against speculation while the facts remained under review.

Kirk’s death removes a prominent figure from the conservative activist landscape and will likely have immediate reverberations within the groups and donors that supported Turning Point. The organization has drawn criticism and praise in equal measure for its aggressive campus organizing and vigorous defense of conservative positions, a combination that helped it grow into a major force in Republican politics.

As investigators continue to piece together the circumstances of the shooting, the death of a high-profile partisan activist at a college event is certain to intensify national debate about security at political gatherings and the climate of political rhetoric.

Turning Point did not immediately announce changes to its tour schedule. Messages seeking comment from key donors and political allies were not returned before publication. Family members asked for privacy as the investigation proceeded.