The fate of a marriage if a woman converts to Islam, then marries, and then her first husband converts to Islam

Question:
May Allah reward you, Honorable Shaykh. The questioner says: If a married woman converts to Islam, and then a Muslim marries her, and then after a period of time her first husband converts to Islam

Answer:
He has no claim on her if she has married; that is settled, he has no right to her. However, the Muslim must not marry her until she completes her waiting period ('iddah), because if her husband converts to Islam while she is in the waiting period, she is returned to him. If she completes the waiting period and he has not converted to Islam, she is divorced from him, and it is permissible for the Muslim to marry her.