Suspected Charlie Kirk assassin Tyler Robinson allegedly confessed to the slaying in an online chat before he surrendered to police, it has emerged.

'Hey guys, I have bad news for you all,' Robinson allegedly wrote in a message on Discord, The Washington Post reports.

'It was me at UVU yesterday. im sorry for all of this.'

The suspected gunman was arrested late Thursday night and is being held in a Utah jail on suspicion of aggravated murder.

He'll appear before a court on Tuesday and will likely face capital murder charges that could see him executed by a firing squad.