Tesla died at the age of 86 in room 3327 of the Hotel New Yorker. His obsession with the number 3 was clearly visible when choosing a room to live in. On 7 January 1943 his body was found by maid Alice Monaghan who ignored the “do not disturb'' sign and entered Tesla’s room after seeing this sign two days earlier. The medical examiner determined the cause of his death as coronary thrombosis. Two days after Nikola Tesla’s death, a professor at M.I.T. and established electrical engineer John G. Trump was called by the Federal Bureau of Investigation to analyze his items, which were being held in the custody of the Alien Property Custodian. Trump’s report concluded that there was no hazard, saying that his research was primarily speculative, but did not include new, workable principles or methods for their realization.