Naperville firefighters are investigating the cause of a Thursday night blaze that killed one person in an apartment building on the 100 block of Douglas Road.
The identity of the victim has not yet been released.
Firefighters said neighbors called at 11:33 p.m. to report smoke and fire coming from the building.
The first firefighters on the scene found smoke coming from a second-floor window of the three-story structure, authorities said.
The unconscious victim was found during a search of the apartment unit where the fire began, authorities said.
Firefighters said the victim was carried outside to an ambulance where attempts at resuscitation were unsuccessful. The victim was pronounced dead at Edward Hospital.
The fire was brought under control within 10 minutes, authorities said, and no other injuries were reported.
They said there was fire and smoke damage on the second and third floors of the apartment building as well as the attic.
Damage was estimated near $100,000 and two units were deemed uninhabitable.
Several area fire departments provided coverage at Naperville's fire stations during the fire.