CBS News quoted authorities on July 5 as saying that the man - whose identity has not been released - appeared to have died from extreme heat.
Last weekend, temperatures in the Death Valley National Park area were over 120 degrees Fahrenheit during the day and over 100 degrees Fahrenheit at night.
According to preliminary investigation, the high temperature may have caused the man to drive off the road.
Local officials said the man was found dead in his car on the morning of July 3.
The car was near the highway north of the park. It had not been hit but had two flat tires. The air conditioning was not working and the windows were rolled down. The man was pronounced dead at the scene after rangers and investigators arrived.
The hottest day in Earth's history was recorded on July 3. The record was set again shortly after, on July 4 and 5.
Cities across the country from Medford, Oregon to Tampa, Florida are experiencing record-breaking temperatures, according to National Weather Service meteorologist Zack Taylor.
Millions of Americans are under heat warnings, including across southern Arizona and California.
Last weekend, a 57-year-old woman also died while hiking in scorching heat in Grand Canyon National Park.
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