Hogg died on August 19, 1975, at the age of 93, from a heart attack resulting from atheroma. She had been vacationing in London at the time, but fell as she was getting into a taxi, and died a few days later in a London hospital. An autopsy report revealed that her death was not related to the earlier fall. On receiving news of her death, the University of Texas declared two days of mourning and flew the flag at half-staff.