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.

Investigators have spoken to Robinson's relatives and carried out a search warrant at his family's home in Washington, about 240 miles (390 kilometers) southwest of Utah Valley University, where the shooting took place.

Here are things to know about the killing:

What do we know about motive?

Authorities have not provided many details a

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