Police tell Action News they are actively investigating the case involving Ryder Morrison, who was killed back in June.
The Benton County Coroner says the toddler died of blunt force trauma to the head, and that the boy's body also had signs of prior abuse.
"We have people that we've talked to in the case," says Richland Police Captain Mike Cobb. "But to affix labels to them, like 'person of interest' or 'criminal suspect' could derails someone's life. And we're just not willing to do that without looking at all the evidence."
Authorities say much of the evidence collected from the boy's body and his home is still being processed by local experts. But they gave no timeline on when it might be finished.
Ryder's family insists the boy was being watched by a nanny when he received that fatal head injury.