Fourteen jurors have been selected to hear the case of a 76-year-old white Milwaukee man charged with first-degree homicide in the killing of an unarmed 13-year-old black boy last year. The man, John Henry Spooner, is accused of killing a neighbor, Darius Simmons, on a sidewalk near their homes. Prosecutors say Mr. Spooner accused the teenager of breaking into his home and stealing guns. When he denied the thefts, Mr. Spooner shot him in the chest from five feet away, then shot him again as he tried to run. Mr. Spooner’s lawyer says he will argue that his client did not intend to kill. The jury pool contained four black people, but the defense removed three of them. The prosecutor, Mark Williams, told the judge he wants to take up the issue on Tuesday.