The head of Western Australia's Corruption and Crime Commission (CCC), Roger Macknay, is stepping down from the role.
The QC and former judge of the District Court of WA retired from the bench in 2009 and was appointed commissioner of the corruption watchdog in 2011.
Attorney-General Michael Mischin said Mr Macknay had flagged his desire to step down to spend more time with his family but had not set a date for his departure, to give the state time to find a successor and allow for a smooth transition.
A nominating committee made up of the Chief Justice, the Chief Judge of the District Court and a community representative will submit a list of eligible candidates to the state government.
The CCC has extraordinary powers of investigation and is not without its critics, including WA Police Union president George Tilbury and former premier-turned lobbyist Brian Burke.
The Liberal state government has sought to expand its powers, but failed to push through proposed legislation in its first term.
The government said on Monday it would shortly introduce legislation to the state parliament to enhance the CCC's effectiveness.