In an interview, the wife of the conservative activist Charlie Kirk said she had implored him to wear a bulletproof vest. But she sees divine work in his death.

The voluble former senator, now retired from politics, appears to miss the arena and is mulling a return to it.

© Jason Andrew for The New York Times

The president’s reaction to Charlie Kirk’s assassination shows how much the 31-year-old conservative activist had become a part of the Trump family.

© Todd Anderson for The New York Times

© Dina Litovsky for The New York Times

Mr. Kirk appeared to be speaking in front of a large crowd when a shot rang out, according to video from the scene.

For years, conservatives hoped that the notorious white nationalist would go away. Instead, Mr. Fuentes has gained more traction, even while opposing the president.

© Jamie Kelter Davis for The New York Times