Utah Governor Spencer Cox confirmed that Tyler Robinson, the 22-year-old accused of assassinating conservative activist Charlie Kirk, is refusing to cooperate with investigators. Officials are now turning to his family and friends for answers as the motive remains unclear.

Governor Cox revealed on ABC’s This Week that Robinson has not spoken to investigators since his arrest. “He is not cooperating, but all the people around him were cooperating,” Cox said.

Robinson allegedly climbed a rooftop at Utah Valley University on September 10 and fired a single rifle shot that struck Kirk in the neck, killing him in front of nearly 3,000 attendees.

The 22-year-old will be formally charged on Tuesday, September 16. He remains in custody in Utah, awaiting his first court appearance.

According to affidavits, investigators found phrases etched into Robinson’s bullet casings, including meme references and video game in-jokes, leaving officials puzzled about their meaning.

While Robinson stays silent, his parents and peers have been cooperating. Detectives are interviewing them to uncover whether political extremism, personal grievances, or online influences pushed him to act.

The assassination has intensified concerns over political violence in the US. Kirk, a staunch Trump ally and co-founder of Turning Point USA, was a polarising figure whose rhetoric drew both fervent support and sharp criticism.

Robinson was captured at his parents’ home, nearly 260 miles from the crime scene, following a 33-hour manhunt involving local police, the FBI, and US Marshals.