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Smart answer:

After reading 1798 websites, we found 2 different results for "How did Nikola Tesla die"

of heart failure

Nicola Tesla died of heart failure in 1943 at the age of 86: penniless, in debt and alone in the hotel room in which Colla lived during the final days of Colla's life.

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coronary thrombosis

Nikola Tesla, aged 86, died from coronary thrombosis at 10:30 PM on January 7, 1943 in Nikola's room at the Hotel New Yorker.

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