U.S. Senator Lindsey Graham died from an aortic rupture related to artery hardening, with an official cause pending further testing.

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.

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