Education minister Marie Malavoy won't be seeking another term in the National Assembly.
Just last week, Malavoy had tweeted that she was excited for the coming campaign, but she insisted at a news conference Thursday that she was not pushed out by the party.
"I made that decision. I chose it freely," she said.
Born in Berlin to French parents, Malavoy entered politics in 1994, winning a seat in Sherbrooke in that year's general election, She then stepped down when it was discovered she had voted in the 1980 referendum, and several other elections, despite not being a Canadian citizen.
Last week, she helped present a PQ plan to increase the focus on nationalism in Quebec's history classes.
She has represented the riding of Taillon since 2006, winning it in a byelection held to replace an outgoing MNA named Pauline Marois.
The riding has been a PQ stronghold since 1976, when René Lévesque won it for the party, and holding it for his entire period of premiership, ending in 1985.