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A man has died of heat exposure in Death Valley National Park, the second this summer in an area known for its extreme temperatures.

Peter Hayes Robino, 57, was seen struggling after a walk on a Death Valley trail earlier this month as temperatures hit 119F (48C), the National Park Service said.

Witnesses said Mr Robino, of Los Angeles, crashed off an embankment when he attempted to drive away. He was helped to a shaded area but died shortly after.

A post-mortem examination determined that he died from hyperthermia, whose main symptoms are confusion, irritability and lack of coordination.

"My condolences go out to Mr Robino's family and friends," said Superintendent Mike Reynolds, who was one of the first responders to the emergency.

"His death serves as a reminder not to underestimate the dangers of extreme heat."

In July, a motorcyclist was declared dead from suspected heat exposure in Death Valley after riding in 128F (53C) weather.