Lindsey Graham's cause of death: Was the South Carolina Senator poisoned? His final hours, Ukraine trip, Trump call, medical findings and conspiracy claims explained

The sudden death of Republican Senator Lindsey Graham has triggered a wave of speculation around the world, with a senior adviser to Russian President Vladimir Putin suggesting the longtime lawmaker may have been poisoned and some Iranian media amplifying similar claims. The allegations surfaced after Graham's outspoken support for Ukraine and sanctions against Russia.

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However, US officials have so far said preliminary medical findings point to a natural cardiovascular cause, and investigators have announced no evidence of foul play. So, what exactly happened to Lindsey Graham, and why have Russia, Iran and conspiracy theories become part of the conversation?


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Lindsey Graham cause of death

According to preliminary findings from the District of Columbia medical examiner, Lindsey Graham died from an aortic rupture caused by arteriosclerotic cardiovascular disease, commonly known as hardening of the arteries, reports BBC.

The official death certificate has not yet been finalized because toxicology and microscopic examinations are still underway. However, authorities have not indicated that the senator's death was suspicious.

His office initially announced that Graham had died following a "brief and sudden illness."

What happened in Lindsey Graham's final hours?

Just hours before his death, Graham had been carrying on with a busy schedule. The South Carolina senator had recently returned from an official visit to Ukraine, where he met President Volodymyr Zelenskyy and discussed additional sanctions against Russia.

Back in Washington, Graham also spoke with President Donald Trump before his death. Later that evening, emergency responders were called to Graham's Washington residence after receiving reports of a cardiac emergency.

According to reports, police helped emergency crews enter the home after there was no response. CPR was performed, but Graham could not be revived. The FBI later assisted local authorities, a standard procedure when a senior federal official dies unexpectedly.

Trump says Graham sounded "fine"

President Donald Trump said he had spoken to Graham only hours before his death and noticed nothing unusual. According to Trump, the senator sounded "fine," adding that "other than being tired, he was fine."

Graham had even been scheduled to appear on NBC's Meet the Press the following morning, making his sudden death even more shocking.

Why are poisoning theories spreading?

Soon after Graham's death became public, conspiracy theories spread rapidly across social media.

The speculation intensified after Sergei Markov, a former Kremlin adviser and a senior political analyst closely associated with Russian President Vladimir Putin, suggested that Graham may have been poisoned because of his outspoken support for Ukraine and criticism of Russia.

Some Iranian newspapers also prominently featured Graham's death on their front pages. One publication congratulated Iran on what it described as the death of an "anti-Iran" US senator, while another carried messaging interpreted by observers as a warning directed at President Donald Trump and other senior American officials.

Meanwhile, some MAGA influencers in the United States questioned whether Graham's death was entirely natural, further fueling online speculation. However, no evidence has been presented to support claims that Graham was poisoned or assassinated.

Laura Loomer also called for an investigation

The online speculation gained further attention after conservative commentator and Trump ally Laura Loomer publicly questioned whether Lindsey Graham's death was natural.

In a series of posts on X, Loomer asked whether Russia or Iran could have poisoned Graham and called for a formal investigation into the senator's death. She argued that Graham had recently returned from Ukraine, had been one of Congress' strongest advocates for sanctions against Russia and had also been an outspoken critic of Iran.

Loomer did not present evidence to support the allegation, and her remarks echoed broader speculation already circulating online following comments by a Putin-linked political adviser and coverage in some Iranian media outlets.

US officials, however, have not found evidence of poisoning or foul play. Preliminary findings from the District of Columbia medical examiner indicate Graham died from an aortic rupture caused by arteriosclerotic cardiovascular disease, while toxicology and other laboratory tests are still pending before the death certificate is finalized

Did officials find any evidence of foul play?

No.

The preliminary findings released by the medical examiner point to a fatal aortic rupture linked to arteriosclerotic cardiovascular disease. Law enforcement agencies investigating the senator's death have not announced any evidence suggesting poisoning, assassination or any criminal act.

What is an aortic rupture?

An aortic rupture is one of the deadliest cardiovascular emergencies. The aorta is the body's largest artery, carrying oxygen-rich blood from the heart to the rest of the body. If the artery tears or ruptures, severe internal bleeding can occur within minutes.

Aortic dissection Causes

• Sudden severe chest pain
• Sharp pain in the back or abdomen
• Shortness of breath
• Collapse or loss of consciousness
• Symptoms of shock

Risk factors include:

• High blood pressure
• Hardening of the arteries
• Smoking
• Older age
• Existing aneurysms
• Certain inherited connective tissue disorders

Without immediate emergency surgery, the condition is frequently fatal.