Lindsey Graham's cause of death revealed after sudden passing at 71

The preliminary cause of death for U.S. Senator Lindsey Graham has been released following an initial investigation by the Washington, D.C., Medical Examiner. The veteran lawmaker passed away early Sunday at the age of 71 after what his office initially described as a brief and sudden illness.

According to an official statement issued by the South Carolina senator's office on Sunday afternoon, the initial finding is "Aortic Dissection due to Arteriosclerotic Cardiovascular Disease."

The spokesperson noted that the official death certificate will remain pending until toxicological and microscopic test results are finalized, at which point the paperwork will be updated to reflect the final findings and classify the manner of death.

Emergency services responded to a 911 call for cardiac arrest at Graham's D.C. residence around 8:30PM on Saturday night, his office said in a statement. He was taken to the George Washington Hospital Emergency Room, where he later passed away. The news quickly sparked intense interest across the political spectrum, particularly after federal law enforcement became involved in the hours following his death.

Federal law enforcement monitors the scene

Before the medical examiner's report was shared with the public, agents from the Federal Bureau of Investigation were seen at Graham's Washington home. FBI Director Kash Patel announced on social media that the bureau was assisting local authorities and had made every necessary resource available for the investigation.

The presence of federal agents fueled rapid speculation, given the timing of Graham's passing and his high-profile role in international affairs. However, federal law enforcement sources later indicated that there was no immediate sign of foul play at the scene.

Lindsey Graham. Credit: Kevin Dietsch / Getty

International tension surrounds the veteran lawmaker

The senator had recently returned from an official trip to Ukraine during the July 4th congressional recess. While there, he met with President Volodymyr Zelensky and visited a drone facility that was subsequently destroyed by Russian forces.

Graham was well known for his strong advocacy of U.S. military aid and involvement in overseas conflicts, making him a frequent target of foreign criticism. Following the news of his death, an Iranian state television host openly celebrated the announcement on a Sunday broadcast.

Some political commentators and media figures initially questioned the sudden nature of the medical emergency.

Meaghan Mobbs, a director at the Independent Women's Forum, publicly called for a full forensic autopsy and counterintelligence consultation, noting that the public deserved certainty given the current threat environment.

Tributes arrive from Washington colleagues

Donald Trump posted a tribute to the late senator on Truth Social, describing him as a true American patriot who was always working.

Graham had been one of the president's closest legislative allies, consistently supporting the administration's policy goals and advising on foreign policy regarding Russia and Iran. The White House ordered flags to be lowered to half-staff in recognition of his service.

Vice President JD Vance also shared words of praise for his former Senate colleague, stating that Graham "fought like hell for the things he believed in, and he was just as willing to go to bat for you when it counted."

Representing the opposite side of the aisle, South Carolina Democratic Representative Jim Clyburn praised their long working relationship. Clyburn stated that their political dynamic was "sometimes partisan and passionate, but always pleasant and productive on behalf of the people of South Carolina."

Featured image credit: Kevin Dietsch / Getty