South Australian Trade and Investment Minister Martin Hamilton-Smith is to quit politics at the next state election in March.
Mr Hamilton-Smith, who sits in parliament as an independent Liberal, will not seek re-election in his eastern suburbs seat of Waite, the Sunday Mail has reported.
The former leader of the Liberal opposition, Mr Hamilton-Smith caused controversy in 2014 when he sensationally quit the Liberals to join the Labor government ministry.
He said it was time for him to step back from political life and focus on his family.
"I've delivered for SA and my local community almost everything I set out to do," he told the Sunday Mail.
"I can step back from politics confident that I did my job."
Mr Hamilton-Smith entered state parliament in 1997 and served as a Liberal government minister before Labor won office in 2002.
He became opposition leader in 2007 but after losing support within the Liberal ranks called a leadership vote in 2009.
After winning the ballot by just one vote, he surprisingly instigated a second vote in a bid to seek a stronger mandate.
He lost the second ballot to Isobel Redmond.
After his defection in 2014, Mr Hamilton-Smith was dubbed a traitor by his former colleagues while recent opinion polls suggested he faced almost certain defeat in Waite at the March state election.
