A banker with ties to Isabel dos Santos was found dead on the same day that Angola’s prosecutor named both him and Africa’s richest woman as suspects in an investigation over alleged mismanagement at state oil company Sonangol.

Nuno Ribeiro da Cunha, 45, appeared to have hanged himself in the garage of his apartment building in Lisbon, Portuguese police said in a statement Thursday. He had attempted to commit suicide earlier this month, the police said.

As the director of private banking at EuroBic, Ribeiro da Cunha was responsible for several multimillion-dollar transfers from a Sonangol account to a company in Dubai, according to documents released by the International Consortium of Investigative Journalists earlier this week.

Lisbon-based EuroBic said in an earlier statement Thursday that Dos Santos has decided to sell her 42.5% stake in the lender.

Angola’s prosecutor general, Helder Pitta Gros, late Wednesday named four people as suspects in the inquiry that covers the period between Dos Santos’s 2016 appointment to Sonangol by her father, then-President Jose Eduardo dos Santos, and when she was fired by her father’s successor, Joao Lourenco, in 2017.

The prosecutor’s announcement marks a further step in the unraveling of Isabel dos Santos’s business empire and a dramatic reversal of fortune for the 46-year-old, who has always portrayed herself as a self-made woman who amassed her wealth of an estimated $2 billion through hard work.

The ICIJ released a series of documents showing how she built her businesses via mostly questionable deals involving state assets during her father’s 38-year tenure. Earlier this month, a court in Angola froze her assets and bank accounts.

Dos Santos, who has been living outside Angola since 2018, said in a statement that the allegations made against her over the last few days were “extremely misleading and untrue” and part of a “well-coordinated political attack.”

Her brother Jose Filomeno, the former head of Angola’s $5 billion sovereign wealth fund, has been on trial since December for his involvement in a $500 million transfer from the central bank to an account in the U.K. during the final days of his father’s rule.

Authorities would like the suspects to come in voluntarily, but international arrest warrants may be considered if they continue to refuse cooperation, Pitta Gros said on state TV. They may also try to block Dos Santos from selling assets and shares held in Portugal, the former colonial ruler, and elsewhere if they were bought with money that was transferred illicitly from Angola, he said.

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