Authorities said 22-year-old Tyler Robinson used a rifle to shoot Kirk with a single bullet to the neck from a rooftop. He was arrested after a 33-hour manhunt.

Six other charges include obstruction of justice and witness tampering, allegedly for ordering his roommate to stay silent.

Gray cited lengthy text message exchanges between Robinson and his roommate, whom he described as “a biological male who was transitioning genders”.

Utah County attorney general Jeff Gray said Tyler Robinson, the suspect in the fatal shooting of Charlie Kirk at Utah Valley University, faces seven charges, including capital murder. Source: Getty / Chet Strange

Robinson and the roommate were in a romantic relationship, Gray said.

Gray cited the messages as saying: “Some hate can’t be negotiated out.”

A polarising figure, he often posted edited clips of his interactions during debates at his many college events.