By Mataeo Smith A mom heartbroken after her 10-year-old son was shot dead over a lost bike race has vowed to “get justice”. Keith “KJ” Frierson was reportedly killed outside the family’s apartment, in Greenholme Drive in Sacramento County, California. Devastated mom, Brittani Frierson, reported that on Saturday afternoon, a second little boy with whom Keith had previously played with fired a gun in retaliation for losing a bike race. Brittani said: “My baby asked me can he go outside to ride. Not even 15 minutes later, my baby was gone. All because he was enjoying a race with some other kids h…