Tyler Robinson has been charged with the murder of conservative influencer Charlie Kirk with prosecutors intending to seek the death penalty.
Robinson, 22, from Washington, Utah, was charged with aggravated murder and weapon and obstruction of justice offences.
The suspect is accused of firing the single rifle shot from a rooftop sniper's nest that fatally hit Kirk in the neck last Wednesday on the campus of Utah Valley University in Orem.
Utah County District Attorney Jeffrey Gray said at a press conference on Tuesday that his office had filed seven counts against Robinson in all, including obstruction of justice for disposing of evidence and witness tampering for directly his roommate to delete texts.
Mr Gray said the state would be inclined to seek the death penalty should Robinson be convicted, but that prosecutors would consider the wishes of Mr Kirk's family before making that decision.
Mr Gray said he had made the decision to seek the death penalty "independently, based solely on the available evidence and circumstances and nature of the crime."
Robinson appeared via video feed from jail on Tuesday afternoon for a hearing in Utah County Justice Court in Provo.
He nodded slightly at times but mostly stared straight ahead as the judge read the charges against him and appointed an attorney to represent him.
Mr Kirk, the 31-year-old co-founder and head of the conservative student movement Turning Point USA and a key ally of President Donald Trump, was speaking at an event attended by 3,000 people when he was gunned down.
The suspect, a third-year student of an electrical apprenticeship at a state technical college, is said to have escaped in the pandemonium following the shooting.
He was arrested on Thursday night at his parents' house, some 260 miles (420 km) southwest of the crime scene, after relatives and a family friend alerted authorities that Robinson had implicated himself in the shooting, according to Governor Spencer Cox.
