The hunt is on for a new Liberal candidate in the state's second-most marginal seat after the sitting member resigned.
Liberal member Glenn Brookes on Saturday said the decision not to recontest East Hills at the March 2019 election was not taken lightly.
He won the seat by just 372 votes in the 2015 election.
The only seat in NSW more marginal is Orange, which the Shooters, Fishers and Farmers Party won off the Nationals by 50 votes in a 2016 by-election.
Mr Brookes was the first non-Labor member for East Hills in 58 years after winning by less than 500 votes in 2011.
"I began this journey with one goal - to stop the neglect of this seat," he said in a statement on Saturday.
"Unfortunately by being considered a 'safe Labor seat' train services were being cancelled, roads deteriorating and hospital funding had dried up.
"By fighting for the people of our region, we now have better infrastructure and more opportunities within our area."
Mr Brookes pledged to help the new Liberal candidate retain the seat at the March election.
The man Mr Brookes defeated in the 2015 election, Cameron Murphy, has again been named Labor's candidate.
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