A 21-year-old man was killed in a fire at his Albany Park neighborhood home early Monday on the Northwest Side.

Firefighters responded to the blaze about 3:10 a.m. and found flames in the attic of the single-family home in the 4700 block of North Harding, according to Chicago Fire Department Cmdr. Walter Schroeder.

Francisco Sanchez was taken from the home to Swedish Covenant Hospital, where he died within the hour, according to Chicago Police and the Cook County medical examiner’s office.

An autopsy Tuesday found that Sanchez died of smoke inhalation and ruled his death an accident.

The fire was extinguished in about 20 minutes, Schroeder said. The cause of the blaze was still under investigation Tuesday.