The U.S. Senator died from an aortic dissection, when the lining of the artery tears.

Sen. Lindsey Graham died at 71 of an aortic dissection due to arteriosclerotic cardiovascular disease. An ER doctor explains why it kills so fast and the warning signs.

Graham's death sparks questions on cardiac arrest that is caused by an electrical malfunction in the heart that disrupts its pumping action. The heart then stops beating.

Sen. Lindsey Graham (R-SC) likely died of a heart attack. The senator had a family his tory, with his father dying from a heart attack at 68.