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PROVO, Utah – The Utah County Attorney's Office told Fox News they are "optimistic" that charges will be filed on Tuesday against Tyler Robinson, the 22-year-old Utah native who was arrested last week for the assassination of conservative influencer Charlie Kirk.

Utah County Attorney Jeff Gray is planning a noon MDT press conference on Tuesday at the Utah County Health & Justice Building in Provo, Utah – about a 15-minute drive from Utah Valley University's campus, where Kirk was killed less than one week ago.

The press conference is scheduled as prosecutors approach the three-business-day deadline to issue formal charging documents against Robinson, who was arrested on Friday at his home in Washington, Utah, following a 3

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