Though Mr Ozawa has repeatedly denied knowledge of any murky transactions, he was forced to resign from a high-ranking position in the DPJ in June partly because the scandal was damaging the government's popularity.
Ms Wong decided to announce the news earlier this week because she acknowledged there would be interest from the public as a result of her high-ranking position within the government and because she wanted to protect her pregnant partner from any undue publicity.
His escape from Camp 14 in 2005, when he was 22 came about because of a chance encounter with a new inmate, a man who had held a high-ranking government position.