The woman has been identified as 76-year-old Patricia Clausen, according to the Will County Coroner.
Crews were called to the scene around 8 p.m., after a 911 call from a neighbor. Firefighters found Clausen alone in the living room, where the fire started, Sun-Times Media reports.
Clausen was taken to Silver Cross Hospital in New Lenox, where she was pronounced dead.
The cause of the fire is under investigation.