CNNSt. Louis boy, 11, left alone with sister shoots and kills persistent teen ...CNN(CNN) An 11-year-old left at home to defend himself and his 4-year-old sister staved off several home invasion attempts before finally shooting and killing a 16-year-old intruder, police say. Police officers arrived after 2 p.m. Thursday to the home on ...Young boy (11) left home alone fatally shoots teen intruderIrish IndependentTeenage intruder shot by 11-year-old boy in St LouisTelegraph.co.ukSt.