Authorities are still trying to learn more about what motivated the fatal shooting of Charlie Kirk at a college in Utah, as authorities aim to bring formal charges this week against the man they arrested in connection with the killing.

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 as early as Tuesday, when he will make his first court appearance. Authorities have said the crimes in Kirk's death include aggravated murder, obstruction of justice and felony discharge of a firearm.

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 U

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