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Labour list MP Darien Fenton has confirmed she will leave Parliament at the general election in September.
Ms Fenton, a former trade unionist, said she was grateful for the opportunity to have served at Parliament for nearly nine years.
"I thank my party, all of my colleagues, the union movement and particularly my union, the Service & Food Workers Union for the opportunity I have been given."
She said she planned to "return to the coalface" to help fight for workers' rights.
Labour leader David Cunliffe said Ms Fenton had made a strong contribution to the Labour movement and had taken a leading role in the developing the party's industrial relations policy.
Ms Fenton was elected via the party list in 2005. She has worked as the party's junior whip and labour spokeswoman.
She lost the transport and immigration portfolios in a caucus reshuffle last week, and was now spokeswoman for tourism.
Labour MPs Rajen Prasad and Ross Robertson have already confirmed they will not seek re-election in September.
- By Isaac Davison of the New Zealand Herald