The South Carolina senator suffered an aortic dissection related to hardened arteries, though final laboratory tests have not been completed.
WASHINGTON — Sen. Lindsey Graham died from an aortic dissection caused by arteriosclerotic cardiovascular disease, according to preliminary findings released by his office after an examination by the District of Columbia medical examiner. Graham, a South Carolina Republican and prominent voice on foreign policy, was 71.
The finding provides the clearest medical explanation yet for Graham’s sudden death Saturday night. An aortic dissection occurs when a tear develops in the inner layer of the aorta, the body’s main artery. Graham’s office said the tear was connected to arteriosclerosis, a condition involving the thickening and hardening of artery walls. A final death certificate remains pending while toxicological and microscopic testing continues.
Graham’s office had initially said he died after a “brief and sudden illness.” Emergency crews were called to his Capitol Hill residence Saturday evening following a report involving chest pain. Radio traffic later described a man in cardiac arrest, and responders performed CPR before taking him to George Washington University Hospital. Graham’s death was announced early Sunday.
The senator had returned to Washington only hours earlier from Ukraine, where he met with President Volodymyr Zelensky and other officials. Graham had told reporters in Kyiv that a bipartisan group of senators reached an agreement with the White House to advance new sanctions against Russia. The timing of his death after the overseas trip led to unsupported claims online suggesting foreign involvement.
Authorities have released no evidence indicating that Graham died because of criminal activity. The preliminary medical finding points instead to a serious cardiovascular condition. The FBI said it was assisting local authorities and making resources available, but the agency did not say its involvement showed that foul play was suspected. The final medical classification will be made after the remaining tests are completed.
An aortic dissection can interrupt blood flow to major organs and may become fatal quickly. The condition is different from a heart attack, though both can produce sudden chest pain and other medical emergencies. Graham’s preliminary report identified disease in the arteries as the underlying factor connected to the tear. Officials have not released further details about whether he had previously been diagnosed with that condition.
President Donald Trump said he spoke with Graham on Saturday evening, shortly before emergency personnel were called. Trump said Graham told him he was tired but otherwise appeared fine. The president later called Graham a close friend and praised him as a patriot. Lawmakers from both parties also issued tributes, often noting Graham’s long involvement in national security, judicial nominations and bipartisan Senate negotiations.
Graham entered the House in 1995 and began serving in the Senate in 2003 after succeeding Strom Thurmond. He became one of Washington’s best-known advocates for an assertive American role overseas and traveled frequently to conflict zones. He served on several major Senate committees and, at the time of his death, chaired the Senate Budget Committee. He was also seeking another term in the 2026 election.
His death reduced the Republican majority in the Senate and created an immediate vacancy in South Carolina’s delegation. State law gives the governor authority to appoint a temporary replacement. The state also must address the election process for the remainder of Graham’s term and the seat’s next full term, though the timing and procedures will depend on state election rules and official announcements.
The medical examiner’s preliminary assessment remains subject to confirmation. Graham’s office said the death certificate will be updated with an official cause and manner of death after toxicological and microscopic examinations are finished. Until then, the available findings identify an aortic dissection tied to cardiovascular disease as the likely cause, while claims of criminal involvement remain unsupported.
Author note: Last updated July 15, 2026.