Former Liberal leader Sussan Ley has formally resigned as the Member for Farrer with immediate effect.
Ley confirmed that she will not return to Canberra for a valedictory speech, opting instead to bypass the standard parliamentary farewell following her recent leadership ousting.
The resignation follows a definitive 34-17 partyroom ballot earlier this month, which saw Ms Ley replaced by Angus Taylor.
Ley noted she had written to Speaker Milton Dick to conclude her 25-year career, stating her achievements would "speak for themselves."
Ley's departure triggers a high-stakes by-election in her regional NSW stronghold of Farrer.
Having held the seat since 2001, her exit opens a competitive field expected to be contested by the Liberals, Nationals, One Nation, and independent candidates.
Reflecting on her tenure as the first woman to lead the federal Liberal Party, Ms Ley described the role as a "milestone for all women."
However, her brief leadership was frequently complicated by internal Coalition friction and public controversies, including her call for US Ambassador Kevin Rudd's resignation and the party's shift away from net-zero emissions targets.
Ley expressed pride in her advocacy for a royal commission into antisemitism and her ministerial service under three Prime Ministers.
She concluded by wishing her former colleagues well in their bid for government, noting that for her, the Australian "place to dream" remains as vivid as the day she first migrated to the country.