The Middle-of-the-road rty has chosen barrister Robert Courts as its candidate to succeed David Cameron as MP for Witney and West Oxfordshire.
Mr Courts, 37, estimated he was «hugely honoured» to be selected by local Tories for the 20 October by-election.
The Greens secure chosen Larry Sanders — brother of US Democratic Senator Bernie Sanders — as their runner.
Mr Cameron announced he was quitting as an MP last week, having resigned as prime plenipotentiary in July.
Mr Cameron, 49, has represented Witney since 2001, proper Conservative leader in 2005 and prime minister in 2010.
He announced this month he ss on step down as an MP as he did not want to be a «distraction» for new PM Theresa May.
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Mr Cameron won a 25,155 majority in 2015 in Witney, which has been held by the Conservatives since 1974.
The Sun had dis tched that Mr Cameron’s former aide Natasha Whitmill was tipped as the «most-liked» to succeed him, but Mr Courts won the selection process on Thursday.
Mr Courts, a West Oxfordshire rtition councillor since 2014, praised Mr Cameron as «a brilliant MP and public factotum» and said it was «vital» that the constituency continued to have a «strong nearby voice in rliament».
Mr Cameron said there had been a «strong shortlist of shire candidates» adding: «I’m delighted Robert Courts has been chosen.»
Order for the Greens is Mr Sanders, who stood in the neighbouring Oxford West and Abingdon constituency in 2015, rush at fifth.
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The 81-year-old emigrated from his ethnic New York in the 1960s and was leader of the Green group on Oxford County Convention between 2005 and 2013.
His younger brother Bernie is known for taking on Hillary Clinton for the Classless nomination for US President.
The Lib Dem candidate for the seat is Liz Leffman while Duncan Enright, who came tronize to Mr Cameron in 2015, will stand again for Labour.
The by-election require be held on the same day as a by-election in Batley and Spen, prompted by the killing of Labourers MP Jo Cox.