Dhaka, Bangladesh (BBN)-Arafat Rahman Koko, the younger son of BNP Chairperson Khaleda Zia, died of cardiac arrest in Malaysia on Saturday.
Shairul Kabir Khan, media wing member of Khaleda's Gulshan office, confirmed this.
Koko was undergoing treatment at a hospital in Malaysia, he added.
Detail of the incident however was not known immediately.
Tarique Rahman and Koko, both the sons of Khaleda, also a former prime minister of Bangladesh, faced different corruption charges in the country after the 1/11 political changeover in 2007.
After their release on parole in the next year, Koko flew to Thailand.
Later, he moved to Malaysia and had been staying there.
BBN/ASI/AD-24Jan15-4:30pm (BST)