"He died on his way to a hospital following a heart attack," Sohel was quoted as saying by local media.
Koko was 45.
But BNP sources said Zia, who is now spearheading a massive anti-government campaign enforcing a violent nationwide blockade since January 6, earlier today met her younger brother and his wife at her office to "discuss Koko's health condition".
Unlike his brother, Koko preferred to stay away from politics and maintain a low-profile though he was known for his passion for sports.
Koko, however, was arrested on September 2007 on graft charges under a massive anti-graft campaign under emergency rules during the past army backed interim regime and was paroled for treatment abroad in July 2008.
Zia met Koko last in Singapore in 2012.
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