The incident happened in June 2010, when the boy was 14 years old.
Prosecutors said he and a friend were riding their bicycles, when the boy saw a 17-year-old staring at him.
The two got into an argument before the 14-year-old pulled out a gun and shot the older boy to death.
That 14-year-old was tried as an adult.
The friend who was with him admitted to being an accessory. He was sentenced to three years in juvenile hall.
