OREM, Utah —The man accused in the Charlie Kirk assassination , Tyler Robinson, had earlier expressed to family his opposition to the viewpoints of the conservative activist, the authorities said Friday in announcing an arrest in a targeted killing that raised fresh alarms about political violence in the United States.

Robinson, 22, had become “more political” in the run-up to the shooting and had indicated to a family friend afterward that he was responsible, Utah Gov. Spencer Cox said. Cox also cited as key pieces of evidence engravings on bullets found in a rifle believed used in the attack as well as chatting app messages attributed to the shooting suspect that a roommate shared with law enforcement.

Cox, a Republican, called Kirk’s killing an “attack on the American experiment,” a

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