DALLAS—An 18-year-old man has been arrested after the body of a 4-year-old boy was found lying on a neighborhood street in Dallas, police said Sunday. Police said that Darriynn Brown has been charged with kidnapping and theft. Police say they also anticipate additional charges pending the results of a forensic analysis. Brown was being held Sunday in Dallas County jail on a $750,000 bond. Jail records did not list an attorney for him. Police received a call that there was a child dead in the street at about 6:50 a.m. Saturday. Assistant Police Chief Albert Martinez has said it appeared the child suffered a violent death and that “an edged weapon” was used. He said it’s believed the child was killed at about 5 a.m. The child’s name hasn’t been released, but he’s believed to have lived in the southwest Dallas neighborhood where he was found, Martinez said. Antwainese Square, …