Immediate Cause of Death
Peter Sellers died from a heart attack on July 24, 1980, at the age of 64. The official cause of death was coronary thrombosis, which blocked blood flow to his heart and led to cardiac arrest according to Britannica.
The heart attack occurred at his home in London after a period of declining health. Emergency services were called, but he was pronounced dead shortly after arrival at a hospital, with the coroner listing the immediate cause as acute myocardial infarction reported by the BBC.
Underlying Health Conditions
Before his death, Sellers suffered from several chronic conditions that contributed to his risk of a heart attack. He had a history of high blood pressure, diabetes, and obesity, all of which are major risk factors for coronary heart disease.
He also experienced severe anxiety and insomnia, which were documented in biographies and interviews. These issues often led to heavy smoking and alcohol use, further increasing his cardiovascular risk per Mayo Clinic data on heart attack risk factors.
Lifestyle and Career Factors
Sellers had a demanding career in film and television that involved intense schedules, frequent travel, and high-pressure performances. These factors contributed to chronic stress, which is known to elevate the risk of heart disease and sudden cardiac events.
His lifestyle included long periods of poor diet, limited exercise, and substance use, which compounded the effects of his existing medical conditions. Public records and biographies note that his health worsened in the years leading up to his death per the American Heart Association.