Sixteen years ago today, a quiet Fourth of July afternoon was interrupted with the stunning news that former NFL quarterback Steve McNair had been shot and killed. McNair was 36 at the time. The official explanation never made complete sense. Quickly solved as a murder-suicide, with McNair shot by his 20-year-old girlfriend, Sahel Kazemi, who then supposedly shot herself. The rush to close the case seemed odd. Police concluded that Kazemi shot McNair execution style, twice in the chest and twice in the head. A subsequent effort to re-open the case ultimately failed. The issue was pressed by Vincent Hill,...