Lawyers for the man accused of killing conservative activist Charlie Kirk are trying to sow doubt about the case. But a prosecutor countered Friday that authorities have “overwhelming” evidence against defendant Tyler Robinson. That includes DNA tests and apparent confessions by Robinson to people he knew. A Utah judge is deciding whether prosecutors have enough evidence to put Robinson on trial. Final arguments in the preliminary hearing are scheduled for September. Kirk was killed as he spoke to a crowd of thousands at Utah Valley University on Sept. 10. Robinson is charged with aggravated murder and has not entered a plea. He turned himself in a day after the conservative activist was killed.