A statement from Graham's office said the Medical Examiner of the District of Columbia’s preliminary findings are the senator died of aortic dissection due to arteriosclerotic cardiovascular disease.

The South Carolina senator’s office said the 71-year-old died after a “brief and sudden illness.”

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.

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.