America is unusually bad at clearing up homicides

For the past three years Donald McGraw, a Chicago transit-authority worker, has been fighting for justice for his nephew. In September 2019 De’Andre Clark, a 25-year-old aspiring actor, was murdered in Chatham, a neighbourhood in the south of the city, while sitting in his car. In the days afterwards, Mr McGraw, with other family members, went street to street posting flyers asking for information and knocking on doors. Within weeks, he had found a witness (a young woman) and a video of the murder, recorded on a doorbell camera. Clark was apparently the victim of a drug deal that went wrong. He had met his killer to buy cannabis, and got into a fight over the quantity. The dealer responded by taking out his gun and shooting him.