WASHINGTON (AP) — Lindsey Graham died from aorta rupture stemming from hardening of arteries: preliminary finding from medical examiner.

WASHINGTON (AP) — The Medical Examiner of the District of Columbia’s preliminary findings are that Republican South Carolina Sen. Lindsey Graham died of aortic dissection due to arteriosclerotic cardiovascular disease, according to a statement released by his office on Sunday.

That is when the aorta is damaged or develops a leak.

The statement also said that the death certificate will be pending until all the toxicological and microscopic testing are finalized. At that point, the death certificate will be updated to reflect the cause of death and appropriately classify the manner of death.