 On Saturday night, August 13, 1977, while running fourth, Isaac pulled out of the Winston 200 late model sportsman race at Hickory Motor Speedway with 40 laps left, and called for a relief driver, collapsing on pit road of heat exhaustion.Weather reports for the area that day showed temperatures which had reached at mid-afternoon, and were still around at the time of Isaac's collapse.Though Isaac was revived briefly at the hospital and was conversing with friends, he later died from a heart attack caused by heat exhaustion, at 12