Rex was taken to Integris Baptist Medical Center in critical condition due to smoke inhalation. Rex’s son, a Dallas-based attorney, arrived Thursday and was at the hospital with his mother. Rex also has a son who is a doctor in England, Black said.
Rex’s late husband, John Rex, was president of American Fidelity Assurance Co., and was a well-known Oklahoma City philanthropist.
Berta Rex received a lifetime achievement award from United Way of Central Oklahoma in January.
"It’s our highest honor that includes services the person is involved in beyond the United Way that reaches out to the community,” spokeswoman Erin Brewer said.
"She has been a wonderful friend to United Way through the years, and many of our staff feel a close connection.”
The fire appears accidental, a fire department spokeswoman said.