A judge has ordered a mental evaluation and delayed the trial of an 85-year-old white man who shot Ralph Yarl after the teenage Black honor student came to his Kansas City, Missouri, home by mistake.

Andrew Lester’s lawyer requested the evaluation last month, saying the retired aircraft mechanic’s health has deteriorated so much that he now lacks the capacity to understand the proceedings against him or to assist in his own defense. The prosecution didn’t object to the request.

The trial of Lester had been scheduled to begin Oct. 7. Instead, there will be a hearing the following day.

Lester has pleaded not guilty to charges of first-degree assault and armed criminal action in the April 13, 2023, shooting of Yarl, then 16. Yarl survived the shooting and graduated from high school in the spring. But his family said the shooting took a big emotional toll and has filed a lawsuit against Lester.

The shooting shocked the country and renewed national debates about gun policies and race in the U.S.

Attorney Steve Salmon has long argued that Lester was acting in self-defense, terrified by the stranger who knocked on his door as he settled into bed for the night.

Yarl showed up on Lester’s doorstep after he mixed up the streets where he was supposed to pick up his twin siblings. Yarl testified at an earlier hearing that Lester shot him in the head and uttered, “Don’t come here ever again.” Although the bullet didn’t penetrate Yarl’s brain, the impact knocked him to the ground. Yarl said Lester then shot him in the arm.

In the ensuing months, Lester has had heart issues, a broken hip and hospitalizations, Salmon said. Lester also has lost 50 pounds (23 kilograms), which Salmon blames on the stress he has experienced because of intense scrutiny from the news media and death threats.