Excerpts from abc7chicago.com:

A 54-year-old woman was killed in a fire on the South Side Wednesday morning.

The home, on the corner of Princeton Avenue and 108th Street in West Roseland was fully engulfed by the time the call came in at around 6:40 a.m.

Upstairs, Marshall Lewis, who said he is a Cook County Sheriff’s sergeant, heard his smoke alarm going off and rushed to get out and call 911. He tried to save himself and his landlord, living downstairs.

The flames were so intense, it was hard to get to the victim inside. The 54-year-old woman, fire officials said, was found in her room.

The cause of the fire is under investigation.