Excessive health advisories or warnings will remain in many parts of the country on Wednesday, with at least a third death blamed on the temperature in Missouri.
The Kansas City [Missouri] Star reported that the Jackson County medical examiners were investigating whether high temperatures played a role in the death Tuesday.
A day earlier, the city health department said two other deaths were likely heat-related.
The stifling heat did not keep voters form the polls in Kansas and Missouri, who cast ballots on primary day in triple-digit heat.
The National Weather Service said heat advisories and excessive heat warnings are in effect from the Southern/Central Plains through the Lower Mississippi/Tennessee River Valleys.