The incident happened just after 7:30 p.m. Saturday on Haskins Avenue, near Visalia Avenue, according to the Los Angeles County Sheriff's Department.
The boy's mother, Creole Green, identified him as Princeton Nicholas Jones. She said he had autism.
"My goal... was to give him the proper teachings and all the things that he needed in order to navigate this world independently one day," Green said. "I"m just devastated that my son's life... the door was shut in front of him at nine years old."
The boy's mother added that he was staying at his grandfather's house when the shooting happened.
A GoFundMe account has been set up.
Investigators have not released any details on the shooting or said if anybody is in custody.
DEVELOPING: We will add more details to this report as they become available.