Presidential and Vice Presidential Election and Recall Act Article 29

If the death of one of the candidates for president occurs after the deadline for registration and prior to election day, the Central Election Commission shall immediately issue public notice to stop the election and shall determine a date for a new election.When a new election is to be held in accordance with the provisions of the preceding paragraph, certificates of completion of a joint-signature petition issued to candidates for president and vice president prior to the issuance of public notice to stop the election shall still apply to the new election.
中文原文 總統副總統選舉罷免法(新840809制定)第29條
總統候選人之一於登記截止後至選舉投票日前死亡,中央選舉委員會應即公告停止選舉,並定期重行選舉。
依前項規定辦理之重行選舉,於公告停止選舉前取得之總統、副總統候選人完成連署證明書,於重行選舉仍適用之。

English translation for reference only; the Chinese text prevails. Not legal advice.