A 19-year-old man charged with the fatal shootings of a mother and her 5-year-old son last June was charged Thursday with a third unrelated shooting death that occurred on Halloween last year. Antonio Lewis, of the 5500 block of South Winchester, was charged with first-degree murder for the shooting that occurred Oct. 31, 2012. Thirty-year-old Brandon Johnson was fatally shot in the face when he answered the front door of his home during an apparent drug deal, police said. Lewis was also charged in August with two counts of first-degree murder and one count of attempted first-degree murder, police said....