 Ballistics quickly tied the kid's gun to the shootings on Tuesday. Later yesterday, they also arrested an 18-year-old for being part of the murder plot. As for why this happened? We're still asking the same questions. Why would two juveniles engage in this type of behavior on random victims? So a 16- and 18-year-old with murder on their minds, cops say arresting the two saved a lot of lives here in Charlotte.