Sindika Dokolo, the husband of one of Africa's richest women, Angolan Isabel dos Santos, has died at the age of 48.
Mr Dokolo's family confirmed that he had died in Dubai on Thursday.
Friends said he had been involved in a scuba diving accident.
Mr Dokolo and his wife, 47, have been under investigation by the Angolan authorities for allegedly diverting more than $1bn (Ksh108.7 billion) of state funds.
Ms Dos Santos is the daughter of the former president of Angola, José Eduardo dos Santos.
The couple had denied wrongdoing, and insisted they were the victims of a political vendetta.
Mr Dokolo, who was born in Kinshasa and raised in Belgium and France, was a prolific art collector, amassing thousands of contemporary African works.
His wife, Isabel dos Santos, who has interest in telecommunications and energy industries, has a net worth of $1.4 billion (Ksh152.2 billion), according to Forbes.