Sinn Féin Upper Bann MLA Catherine Seeley has decided not to stand in the next Assembly election.
Sinn Féin president Gerry Adams has wished her well for the future.
"In her relatively short time as a public representative Catherine has made a real difference, first as a Councillor and then as a MLA,” he said.
“She has now decided to return to teaching and I wish her well in that.
“Catherine is a committed Sinn Féin activist. She will continue to play a full part in the party, including as an election agent."
It comes after South Down MLA Caitríona Ruane announced she will not be putting herself in the running after 14 years representing the constituency.