Michael L. Cohen, once a high-flying dealmaker at hedge-fund giant Och-Ziff Capital Management Group, is facing criminal charges that he defrauded an Och-Ziff client in an alleged scheme connected to the firm’s investments in Africa, federal prosecutors said, The Wall Street Journal reports.

According to an indictment filed in Brooklyn federal court in October and unsealed Wednesday, Cohen and others conspired to defraud the client — identified as a UK-based charitable foundation — by recommending investments in the African mining sector without disclosing that he stood to receive millions of dollars in the transaction.