The image below (click on it for a larger version) is the death certificate for my Great Great Grandfather, William Keaton Clemmons. He died on April 17th, 1924 in Bertrand, Mississippi County, Missouri. They were living in Morehouse, Missouri at the time.
The cause of death is Angina Pectoris, this is the medical term for chest pain or discomfort due to coronary heart disease. Angina is a symptom of a condition called myocardial ischemia. It occurs when the heart muscle (myocardium) doesn’t get as much blood (hence as much oxygen) as it needs. This usually happens because one or more of the heart’s arteries (coronary blood vessels that supply blood to the heart muscle) is narrowed or blocked.