what happens to frank underwood in house of cards
He becomes the President of the United States and then gets murdered in the last season.
Frank Underwood (House of Cards)
. In season 2, he is the newly appointed Vice President of the United States, before becoming President of the United States in the season finale.

wiki:18675372
Frank Underwood (House of Cards) [SEP] Introduction
Underwood has been described as conniving, Machiavellian, sociopathic, and a symbol of political corruption. Throughout the series, he manipulates and destroys several people, including those he calls friends, for his own ends. Among other crimes, he personally commits murder twice, signs off on another murder committed by a subordinate, orders the deaths of two former employees, critically injures a member of his cabinet to prevent her testifying against him, and indirectly allows the murder of a civilian for political ends.