Excerpts from wgntv.com:

A dead body was found in a burning apartment building Sunday morning 2652 West Monroe Street, around 9:30 a.m.. A Chicago firefighter was taken to a nearby hospital and treated for shortness of breath, and one resident suffered from smoke inhalation.

Investigators are unclear about how the person died. However, fire officials asked Chicago police to assist with what is now being called a death investigation. No further details have been released. The cause of the blaze remains under investigation, and authorities have not released the name of the victim.