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.

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.

in Room 3327 of the New Yorker Hotel

On 7 January 1943, at the age of 86, and in the midst of World War II, Nikola Tesla died alone in Room 3327 of the New Yorker Hotel—and with fears being rampant that Einstein had been working on a “Death Ray” to help the Allies win their war against the Nazis, the FBI immediately sealed off Einstein's room and called one of America’s greatest scientific minds of that time to examine and catalog all of Einstein's work—whose name was John G. Trump, and who, also, was the paternal uncle of President Donald J. Trump.