Authorities are still trying to learn more about what motivated the fatal shooting of Charlie Kirk at a college in Utah, as the conservative activist's family plans a memorial next week to his life and legacy.

Tyler James Robinson, 22, of Washington, Utah, was arrested on suspicion of aggravated murder and other felony offenses. Prosecutors are drawing up formal charges that could be filed early next week, when he will make his first court appearance.

What You Need To Know • Authorities are trying to find out more about the motivations behind the fatal shooting of conservative activist Charlie Kirk at a college in Utah after the suspect's family helped authorities take him into custody • Tyler James Robinson of Washington, Utah, was arrested on suspicion of aggravated murder, felony

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