Avon coroner Paul Forrest has been suspended on full pay while an investigation is carried out into a mystery complaint.

Mr Forrest was suspended from his post last week pending the outcome of an official investigation. The complaint against him was made in September 2005 but it has taken until now for him to be suspended.

An investigation into his conduct will now be carried out by a judge, who will make a recommendation to the Lord Chancellor and Lord Chief Justice. If it is found he has made inappropriate comments, then he could lose his position.

A coroner is officially responsible for investigating deaths – particularly those which happened in unusual circumstances – as well determining the causes of death.

Mr Forrest's role is currently being carried out by Assistant Deputy Coroner Maria Voisin.

The investigation comes just weeks after the coroners court complex at Flax Bourton, North Somerset – a former Somerset police headquarters and magistrates court – was reopened after undergoing a £2 million refit.

Simon Caplan, a spokesman for Bristol City Council, which employs the Avon Coroner's Court staff, said: "We are not commenting on any matters relating to Mr Forrest. The business of the court is proceeding as usual in line with the regulations laid down by parliament, with all scheduled hearings being presided over by a team of assistant coroners."

Judiciary officials refused to reveal any details about the nature of complaint made against Mr Forrest.

A spokesman for the Office for Judicial Complaints said: "Mr Forrest has been suspended by the Lord Chancellor and Lord Chief Justice from his duties as Coroner, pending the outcome of an investigation into a complaint made to the Office for Judicial Complaints. While the investigation is ongoing it would be inappropriate to comment further."

Mr Forest has told the BBC that he denies any wrongdoing and is taking legal advice. He told the BBC he would be taking the matter to judicial review and expected it to be resolved.