LOS ANGELES (AP) — A Los Angeles County Superior Court jury has convicted a man of first-degree murder in the death of his girlfriend's 8-year-old son.

The jury also found Wednesday that 37-year-old Isauro Aguirre intentionally tortured little Gabriel Fernandez.

Gabriel died May 24, 2013, of injuries that included a fractured skull, broken ribs and burns across his body.

The jury was ordered to return Nov. 27 to begin the penalty phase of the trial, which could lead to the death penalty.

The victim's mother, Pearl Fernandez, faces trial separately. She has pleaded not guilty to murder.

Prosecutors also allege that four county social workers were negligent in the boy's case and have filed charges of child abuse and falsifying records against them.