The Simpsonville man who died after his boat capsized Saturday afternoon in the Martin Creek area of Lake Hartwell has been identified as Carl Dickerson. Coroner Karl Addis says an autopsy showed Dickerson died of a coronary event. He was 58 years old. The boat capsized about 2:30 Saturday afternoon. Another boater helped Dickerson reach the shoreline at Twin Lakes campground. It was then, according to Addis, that Dickerson suffered coronary arrest.