Firefighters found Judy Reifel unconscious in her low-rise garden apartment on Rennie Place around 8 a.m. Friday, Oct. 13, the prosecutor said.
She was taken to Hackensack University Medical Center in critical condition and died there, he said.
"A preliminary investigation has determined that the fire was accidentally set and does not appear to be suspicious," Musella said.
Responders said an oven fire was to blame.
Arrangements had yet to be announced on Saturday, Oct. 14.
Click here to follow Daily Voice Hackensack and receive free news updates.