UPDATE: The grandmother who was critically injured in a house fire on Rubio Street last Wednesday died Thursday afternoon at the Joseph M. Still Burn Center in Augusta, GA. 

The Chattanooga Fire Department says that the victim has been identified as Kimberly Wells, 44.

Fire investigators have determined that the fire that killed Wells was intentionally set, according to CFD spokesman Bruce Garner.

Due to the nature of the crime, fire investigators have asked for assistance from the Violent Crimes Bureau with the Chattanooga Police Department. 

Investigators from both departments will be working together on this case, and they are asking for help from the public. 

A reward of up to $5,000 is being offered to anyone who has information that will lead to the arrest of the person or persons responsible for this crime. 

Anyone with information is urged to call the Tennessee Arson Hotline at 1-800-762-3017.

PREVIOUS STORY: A woman is fighting for her life after being pulled from a house fire Wednesday. 

The 44-year-old grandmother who was seriously injured in this morning's fire at 1725 Rubio Street is listed in critical condition this afternoon at the Joseph M. Still Burn Unit in Augusta, GA.

The victim's name is being withheld by this office until all next of kin have been notified.

The cause of the fire remains under investigation.

PREVIOUS STORY: A woman pulled from a house fire Wednesday morning is fighting for her life, according to the Chattanooga Fire Department.

Four fire department companies responded to the home on Rubio Street about 5:30am Wednesday.

Battalion Chief Lesley Morgan said smoke and flames were shooting out a bedroom window when firefighters arrived.

Neighbors told firefighters that a grandmother, her son and two grandchildren children might still be inside the home.

CFD Engineer Andrew Thomas and Firefighter David Ruffin entered the house to begin searching for victims. 

They found the grandmother in a corner of the living room, on the floor and unconscious. She was carried out of the house, and was treated by firefighters and paramedics.

The children were staying with their mother and not at the home.

The grandmother was transported by EMS to Erlanger Medical Center in critical condition, and is expected to be flown by Life Force Air Medical later this morning to the Joseph M. Still Burn Center in Augusta, GA.

The dollar loss from the fire was estimated at $50,000. 

The cause of the fire is under investigation.