California’s Death Valley National Park has claimed another life in its second heat-related death of the summer, park officials said Monday.

On Aug. 1, a day where temperatures reached nearly 120 degrees Fahrenheit (48.3 degrees Celsius), bystanders saw a man stumble back from the Natural Bridge Trailhead, a one-mile roundtrip trail, according to a news release.

The man, identified as 57-year-old Peter Hayes Robino of Duarte, California, declined their help. Witnesses said his responses did not make sense. He returned to his car and drove off a 20-foot embankment at the edge of the parking lot, the news release said.