The fire in the apartment building in the 5200-block of West North Avenue is being investigated for arson.
Search crews returned to the scene around 8 a.m. Friday.
The Chicago Fire Department confirmed that a body was found in the rubble Friday. Crews were looking for the body of a missing woman.
Relatives of that woman came to the scene Friday morning
Bureau of Alcohol, Tobacco, Firearms and Explosives agents and members of the state fire marshals brought heavy machinery and a search dog to the charred building.
Three other people died, including a 5-year-old boy, a 32-year-old woman and a 76-year-old man. Six were rescued from the building; some of them are still in the hospital recovering.
On Friday, family identified some of the victims as Destiny Henry, 28; Regina Henry, 32 and her 5-year-old son, Jayceon.
"And I just wanna tell Destiny I tried. I tried. I tried. I can't do this. I just want to say, Destiny went out strong. She didn't die in vain," relative Latyra Goodman said.
Some people who live in the neighborhood reported hearing gunshots before seeing the fire.
Thirty-Seventh Ward Alderman Emma Mitts says she's been told the fire is the result of a domestic dispute between two men.
"Apparently there was some shooting outside first, and then that's when someone throw a Molotov bombs," Mitts said.
Grief stricken relatives tried to comfort one another Friday.
"Gina didn't make it; her son didn't make it. She was also three months pregnant," relative Andrea Boyd said.
The family of 28-year-old Destiny Henry sobbed as her body was recovered from the rubble of the three-story building where she and her son, who survived the fire, once lived.
"Like I said, I wasn't leaving from this, from their home until they got her out because I was 100% sure that she was in there," Boyd said.
Relatives say Destiny Henry originally escaped harm when flames engulfed the apartment building, but ran back into the burning building to save her son, who she thought was trapped inside.
"My cousin went back into the fire to look for her son. She did not know that he was already out of the window. If my cousin would've known that, her son was already out of the window. She probably would still be here right now," Goodman said. "We just ask you all please keep the family in your prayers. Keep my auntie, Gina, in your prayers. Just keep them in your prayers."
The man killed was identified by community members as Brad Cummings. He was the editor of The Austin Voice, founded in 1985, giving power to the powerless on Chicago's West Side. A community's force is now gone amid the deadly flames.
"He lived and breathed the Austin community," Ald. Mitts said.
Each word in The Austin Voice highlights the people who often feel forgotten about on the city's West Side.
"Brad has covered so many of our stories," said Rev. Ira Acree with Greater St. John Bible Church. "He sees a neighborhood that has great community stakeholders and who are going against the odds."
That voice is now forever silenced. Mitts said the 76-year-old's body was found huddled in his bathroom.
Four lives are lost as one man's decades-long work now hangs in the balance.
"He may be gone, but we still are committed to saving the paper," Rev. Acree said.
Officials have not officially released the cause of the fire.
Chicago police said no one has been taken into custody. Police would not say if they are looking for someone in connection to the deadly fire.
The Red Cross said the massive blaze displaced over two dozen people.