The matter has drawn attention due to the scale of the funds involved and the senior legal and political figures linked to the inquiry.
Sources familiar with the investigation indicated that the questioning of the advocate forms part of wider efforts to establish the circumstances surrounding the alleged scheme and identify any individuals who may have been involved in planning or facilitating it.
Detectives from the Serious Fraud Investigation Unit are reported to be focusing on communication records, financial transactions, and any correspondence that may shed light on the alleged attempts to influence or extract money in connection with the payout process.
Nyamweya, who is acting on behalf of Mong’are, was reportedly called in to record a statement as part of ongoing inquiries. Authorities have not indicated that charges have been preferred at this stage, as investigations continue.
The allegations under investigation centre on claims of extortion, with detectives seeking to establish whether there was any coordinated effort to unlawfully benefit from the Co-operative Bank shareholder payout.
The payout itself has attracted significant public and financial interest due to its value and the number of shareholders involved.
The Serious Fraud Investigation Unit has been conducting interviews with individuals believed to have information relevant to the case.
Officials say the process is aimed at ensuring accountability and transparency in the handling of high-value financial transactions.
Legal representatives linked to the matter have maintained that due process must be followed and that all individuals are presumed innocent until proven otherwise.
They have also emphasized the importance of allowing investigative agencies to complete their work without interference.
The Co-operative Bank case continues to unfold as authorities seek to determine whether any criminal conduct occurred during discussions or negotiations related to the payout.
Investigators are expected to review additional evidence and may call further individuals for questioning as the inquiry progresses.