If president dies and vice pres becomes pres who becomes VP?

The Vice President, who has now become the President, chooses someone to fill the position of Vice President. That nominee then must be ratified (approved) by both Houses of the U.S. Congress.

According to Amendment XXV to the U.S. Constitution (ratified February 10, 1967), if the President is removed from office, or if the President dies or resigns, the Vice President becomes President. The amendment also provides for the situation where the President is temporarily disabled, such as if the President has a surgical procedure or becomes mentally unstable. Whenever there is a vacancy in the office of the Vice President, the President nominates a Vice President who takes office upon confirmation by a majority vote of both Houses of Congress.