Excerpts from cltv.com:

A man was walking on 79th Street around 11:20 p.m. Monday when he noticed smoke and smelled burning. He knocked on the front door and heard a man inside, clearly in trouble. 

Firefighters responded to the fire at a home in the 7800 block of South Rhodes in the Chatham neighborhood. 50-year-old Rawlin Brown was transported to the University of Chicago Medical Center, where he was pronounced dead.

Investigators blame an electrical issue for starting the fire.