Virginia Lujan, 55, was charged in February with child abuse and related offenses in the teen’s death. (Maricopa County Sheriff's Office)

The Tempe Police Department had been awaiting the medical examiner’s report before considering additional charges. However, Lujan died last month of natural causes while 911 CALLS, POLICE REPORT DETAILS DARK TIMELINE TO ARIZONA GIRL'S TRAGIC DEATH

On Jan. 20, Lujan called 911 to report Granados was unresponsive inside their Tempe townhouse. Officers found the girl on the living room floor with extensive bruising. Lujan told investigators her granddaughter had fallen down the stairs, according to ABC15. 

Granados died at a hospital the following day.

Investigators said the home was "filthy," with trash, insects and unsanitary conditions.

Investigators said the home was "filthy" with trash, insects and unsanitary conditions.  (Fox 10 Phoenix)

Investigators said their home was "filthy," with trash, insects and unsanitary conditions. They discovered a bunk bed that had been converted into a makeshift cage, with baby gates and rails zip-tied to the frame and human waste inside the enclosure, prosecutors said. 

Police units respond to an emergency. (Getty Images)

In February, Lujan was indicted on charges, including CLICK HERE TO GET THE FOX NEWS APP

The Maricopa County Sheriff's Office, Maricopa County Attorney's Office and Tempe Police Department did not immediately respond to Fox News Digital's request for comment. A spokesperson for the Maricopa County Medical Examiner’s Office declined to comment.

Fox News Digital's Michael Dorgan contributed to this report.

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