The memorial for Nava continues to grow and people continue to hunt for the little boy's killer.
"We can't bring Carlos back," said Chief Anthony Batts with the Oakland Police Department, "but what we can do is do what we do well, is bring people to justice."
Police took two people into custody at a hoem in Pittsburg on Tuesday. Investigators believed they were the shooter and another passenger in the car at the center of Monday afternoon's drive-by shooting that killed Nava.
On Wednesday, police issued a carefully-worded statement saying at least one of those suspects is not believed to be linked to Nava's shooting at this time.
Police are now interviewing gang members hoping to learn more.
"We will not put out information 'til we have everyone that (may) have been a participant in custody," Batts said.
"My son died over there, at 65th Avenue and 13th," said Patricia Johnson. "They shot him in front of me. What can I do? What can I do to make it better?"
Johnson was part of the steady stream of mourners on International Boulevard. Johnson knows all too well the pain that Nava's family feels -- in addition to her son, who was killed in a drive-by shooting, her grandson was shot dead in January.
Many people on the streets have similar stories.
Batts had promised to bring swift justice in Nava's murder, but on Wednesday, he's not making the same predictions.
"I'm confident that we have some very good leads that we're following up on," said Batts. "We're going to track down the people that are responsible, but even if we don't do it in a short amount of time, it doesn't mean we're going to give up or stop."
A fund has been established to help Nava's family with funeral expenses. Anyone can make a donation at Wells Fargo Bank by referencing Account number 3981855954 and the San Leandro Marina Branch.