The fire happened at a house in the 5400 block of South Mulligan Avenue, in the Garfield Ridge neighborhood, Chicago Fire Department officials said.
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The elderly woman was found dead at the scene, officials said.
The victim's age and identity were not immediately known.
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CFD said the fire appeared to be caused by smoking materials that were close to supplemental medical oxygen. The house had a working smoke alarm, but the woman was home alone when the fire started.
No further information was immediately available.