The Cheltenham law firm of Gloucestershire coroner Alan Crickmore has been closed following concerns over the way it was being run.
The Solicitors Regulation Authority is investigating allegations of suspected dishonesty against Mr Crickmore.
It is also looking into alleged breaches of the solicitors' code of conduct and accounting rules.
A spokesman said Mr Crickmore now faced a disciplinary panel. He has not been available for comment.
The Solicitors Regulation Authority (SRA) said Mr Crickmore's future as coroner would be decided by the Home Office and Gloucestershire County Council.
A statement from the SRA said: "The practising certificate of Mr Crickmore has been suspended with immediate effect."
Peter Beddoes, of Wright Hassall solicitors in Leamington Spa, Warwickshire, has been appointed to take over his clients' files.
Clients will be offered the chance to reclaim the files or place them with another solicitor.
A statement from the county council said: "While coroners are appointed and paid for by the local authority, any disciplinary action against a coroner would be taken by the Lord Chancellor and Lord Chief Justice.
"Inquests in Gloucestershire will go ahead as normal and the coroner's offices in Cheltenham and Gloucester are open and operating as normal."