Va. Code § 24.2-211
When the Governor-elect is disqualified, resigns, or dies following his election but prior to taking office, the Lieutenant Governor-elect shall succeed to the office of Governor for the full term. When the Governor-elect fails to assume office for any other reason, the Lieutenant Governor-elect shall serve as acting Governor.
Whenever the Governor transmits to the President pro tempore of the Senate and the Speaker of the House of Delegates his written declaration that he is unable to discharge the powers and duties of his office and until he transmits to them a written declaration to the contrary, such powers and duties shall be discharged by the Lieutenant Governor as acting Governor.
Whenever the Attorney General, the President pro tempore of the Senate, and the Speaker of the House of Delegates, or a majority of the total membership of the General Assembly, transmit to the Clerk of the Senate and the Clerk of the House of Delegates their written declaration that the Governor is unable to discharge the powers and duties of his office, the Lieutenant Governor shall immediately assume the powers and duties of the office as acting Governor.
Thereafter, when the Governor transmits to the Clerk of the Senate and the Clerk of the House of Delegates his written declaration that no inability exists, he shall resume the powers and duties of his office unless the Attorney General, the President pro tempore of the Senate, and the Speaker of the House of Delegates, or a majority of the total membership of the General Assembly, transmit within four days to the Clerk of the Senate and the Clerk of the House of Delegates their written declaration that the Governor is unable to discharge the powers and duties of his office. Thereupon the General Assembly shall decide the issue, convening within forty-eight hours for that purpose, if not already in session. If within twenty-one days after receipt of the latter declaration or, if the General Assembly is not in session, within twenty-one days after the General Assembly is required to convene, the General Assembly determines by three-fourths vote of the elected membership of each house of the General Assembly that the Governor is unable to discharge the powers and duties of his office, the Lieutenant Governor shall become Governor; otherwise, the Governor shall resume the powers and duties of his office.
In the case of the removal of the Governor from office or in the case of his disqualification, death or resignation, the Lieutenant Governor shall become Governor.
If a vacancy exists in the office of Lieutenant Governor when the Lieutenant Governor is to succeed to the office of Governor or to serve as acting Governor, the Attorney General, if he is eligible to serve as Governor, shall succeed to the office of Governor for the unexpired term or serve as acting Governor. If the Attorney General is ineligible to serve as Governor, the Speaker of the House of Delegates, if he is eligible to serve as Governor, shall succeed to the office of Governor. If a vacancy exists in the office of the Speaker of the House of Delegates or if the Speaker of the House of Delegates is ineligible to serve as Governor, the House of Delegates shall convene and fill the vacancy.
Va. Code § 24.2-211