An Anglesey councillor suspended for 12 months for bullying and bringing his office in to disrepute has resigned.
An adjudication panel at Llangefni decided Barrie Durkin had breached the Code of Conduct for Councillors by bullying and harassing the council's monitoring officer.
A complaint he bullied the council's chief executive was not upheld.
Mr Durkin claimed he behaved in a robust manner towards officers because he wanted to root out corruption.
The panel rejected the councillor for Llanbedrgoch near Benllech had acted with that motivation.
Mr Durkin had told the panel he believed he was "abused, threatened and treated as if he didn't exist" because he had set himself the task of exposing a culture of wrongdoing and lawbreaking by certain officials and councillors.
The panel had also heard from the council's former chief executive David Bowles, who was robust in his view that Mr Durkin's approach to problem solving was totally "scatter gun" and that he practised "conspiracy theories gone mad".
Mr Durkin tended his resignation as councillor on Friday following the panel's decision on Thursday.
Local Government Minister Carl Sargeant appointed five commissioners to run the authority last year.
The commissioners were appointed after what Mr Sargeant has described as "chronic political infighting and misbehaviour".
They were initially in place until the end of this month.
However, they will remain until the end of September 2012, to allow a senior management team to be appointed.