In Bolton, Mississippi, 83-year-old Martha Irene Van Egmond died after falling in her garden on June 27.
Her husband Rick also fell while trying to help her, leaving them stranded for hours.
Disruptions in Washington DC
Blistering conditions caused widespread disruptions in Washington DC. Emergency personnel treated 51 people for heat-related complications on Saturday evening, transporting 12 to hospitals.
The extreme weather forced cancellation of the Independence Day parade and temporarily closed the Great American State Fair on the National Mall after 44 visitors needed medical treatment.
The heat dome began shifting southward into the mid-Atlantic and southeastern regions on Sunday.
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The National Weather Service advises staying hydrated, remaining indoors with air conditioning, and checking on vulnerable neighbors.
