Dark details about Gabriel's story come to light as a shadowy source from inside the Department of Family and Children Services suggests his case wasn't handled properly.

With hundreds of witnesses and thousands of documents, the trial of Isauro Aguirre begins, with Deputy District Attorney Jonathan Hatami seeking the death penalty.

Focus shifts to Gabriel's mother, Pearl, and the role she may have played in his death; Gabriel's teacher recalls a series of calls to child services.

At Isauro Aguirre's trial, a former security guard details his attempts to help Gabriel that hit a dead end with social services and the sheriff's department.

The social workers fight to clear their names in court; with the cameras turned off, Gabriel's siblings take the stand and give graphic testimony.

As L.A. County assesses the cracks of a broken system, the jury reaches a verdict in Isauro Aguirre's case; Pearl Fernandez gets her day in court.