PROVO, Utah (AP) — Lawyers for the man charged with killing conservative activist Charlie Kirk tried to sow doubt about the case Friday, while a prosecutor countered that authorities have “overwhelming” evidence that includes DNA tests and apparent confessions by defendant Tyler Robinson.

Judge Tony Graf will decide if the case should advance to a trial after he hears closing arguments in Robinson’s preliminary hearing on Sept. 1.

Kirk, 31, was killed as he spoke to a crowd of thousands at Utah Valley University on Sept. 10, 2025. Robinson is charged with aggravated murder and could face the death penalty.

Friday’s proceedings capped a week of testimony and brought an emotional moment for Kirk’s family when the court played surveillance video that prosecutors said showed Robinson on the rooftop where he allegedly fired a single bullet that hit Kirk in the neck.

Kirk’s widow, Erika, watched intently as a person said to be Robinson ran across the roof. When the figure dropped to a crawl near the roof’s edge, Erika Kirk turned and embraced Charlie Kirk’s mother, Kathryn, who was crying. They held each other and looked away until the video was almost over.

Prosecutors this week presented a recorded interview with a former roommate, Lance Twiggs, who was also Robinson’s romantic partner. Twiggs said the 23-year-old defendant expressed remorse for the shooting before turning himself in.

Lawyers from the Utah County Attorney’s Office also offered DNA analysis that investigators said linked Robinson to both the suspected murder weapon and a tool he allegedly used to etch messages onto bullet cartridges.

Robinson’s team did not offer any alternative theories for who is responsible for Kirk’s death. But one of his attorneys, Michael Burt, repeatedly questioned the reliability of DNA tests and other evidence cited by prosecutors. Experts say the science behind DNA testing is sound.

Chief Deputy Utah County Attorney Chad Grunander countered that prosecutors already had met the burden of proof needed to advance the case to trial.

“Your honor’s heard four days of testimony now. The evidence is overwhelming. It’s devastating,” Grunander said.

Robinson has not entered a plea. He turned himself in a day after the shooting