None of the individuals who were elected as President died before taking office. William Henry Harrison was sworn in and died 31 days later.
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Ronald Reagan.
In this event the newly elected vice-president would take office on Jan. 20 . He would then nominate a new vice-president who would have to be approved by Congress in order to take office.
First he has to be legally elected as President or else become president by succession. Second he must be "sworn in" by taking the oath of office before a person who is legally qualified to administer oaths.
Technically, 12. In the most extreme of circumstances, a VP could become president for 4 years if the president were to be killed immediately after taking office. He/she could then be elected twice, equalling 8 years total as the elected president.
John Tyler in 1841. He had been elected Vice President in 1840, with President William Henry Harrison. When Harrison died one month after taking office, VP Tyler took over.