The first-degree murder charges against Stephon Terrell Shannon and an unnamed 15-year-old detail retaliatory street justice that police and community leaders say led to 5-year-old Nizzel George's death last Tuesday, when the shooters allegedly fired at the boy's house as payback for an earlier shooting. It's a culture of silence and retribution that police and others decried as they urged more witnesses to come forward, the Star Tribune reports.