Witnesses said they saw five men flee after Friday night's shooting and Sacramento County Sheriff's investigators believe the victims were targets of the attack.
Sgt. Tess Deterding said a 27-year-old woman died after sustaining multiple gunshot wounds. The injured included a 30-year-old man who was taken to the hospital in critical condition.
A 26-year-old man and the young boy were listed in stable condition.
Detectives have not determined a motive for the attack.