The gunman then stood over the youth’s prone body and blasted away some more, striking the boy multiple times in the torso before he and the lookout both fled.
Christopher was pronounced dead where he lay, in a pool of blood amid eight shell casings cast from a .45-caliber pistol, according to sources.
The boy’s older brother is a “very active leader” in a notorious and violent gang known as 280, law-enforcement said.
Police do not suspect that Christopher was mistaken for his brother.