She has been identified to the Cook County Medical Examiner's Office as Doris Moore.
Family members found Moore on the floor of a home in the 300-block of West 115th Street at about 7:35 p.m. She was rushed to Christ Medical Center in Oak Lawn, where she was pronounced dead at about 8:15 p.m.
Police said she had suffered extensive trauma to her face. An autopsy Tuesday by the Cook County Medical Examiner's Office found that she died of a gunshot wound to the head. Her death was ruled a homicide.
Area South police are investigating and no one is in custody.
Sun-Times Media Wire contributed to this report