A by-election was held for the New South Wales Legislative Assembly seat of Penrith on 19 June 2010. The by-election was triggered by the resignation of sitting Labor member and former Parliamentary Secretary for Education and Training Karyn Paluzzano, who had lied to an Independent Commission Against Corruption (ICAC) inquiry over her actions, such as signing false staff payslips and rorting her electoral mail allowance. Paluzzano resigned from Cabinet after she admitted lying to ICAC. Paluzzano resigned from Parliament on 7 May 2010, hours after being suspended from the Labor Party.