A reward is still being offered.
Dominique Peatry's family is very frustrated. They've made several appeals to the public, but no suspects have been identified.
Peatry would have turned 15 years old Wednesday had she not been shot to death at a birthday party in Lancaster on September 5.
Detectives say the shooting happened after 1 a.m. following an argument between several people at a party.
Investigators say the shooter fired several rounds into a crowd of children and adults. Six adults and children were wounded. Peatry died. The gunman has not been found.
Wednesday, Peatry's family is pleading for help catching the shooter.
"It's very heartbreaking 'cause they are just walking around like everything is fine and my baby is gone," said Peatry's mother, Verona Pinnock. "I don't think that's right. I am pleading to the public to please come forward."
County and city officials are offering a combined $30,000 reward for information leading to an arrest and conviction of the killer.
Detectives say given there was a house full of people at the party when Peatry was gunned down, someone needs to come forward to help identify a suspect.
"There were literally dozens of potential witnesses at that party that evening. Very few have come forward. That obviously hampers the progress being made," said L.A. County Sheriff's Lt. Pat Nelson.
"I know that there were several people at the party who actually know who killed Dominique, but no one is stepping forward and I think it's really sad," said Peatry's grandmother, Jacqueline Peatry.
"Speaking to the person who did it, you did it, you know it was wrong," said Peatry's sister, Kasemeray Manson. "I am sure you did not even mean to hit her, to kill her, but you did. It's just a baby. What if it was your sister, what if it was your little brother?"
If you have information related to the case, you're urged to call L.A. County Sheriff's homicide detectives at (323) 890-5500.