"I have enjoyed my two years of service to our State and to the Democratic Party. There is much work to be done on the vital issues of good government, public education and job creation in North Carolina and I look forward to continuing to work to better our State in the years to come," he said.
Parker fought hard to keep his job during a sexual harassment scandal that rocked the party's headquarters last spring.
Former executive director Jay Parmley stepped down in April, after a former staffer, Adrian Ortega, accused him of sexual harassment. Parmley denied any wrongdoing.
Top Democrats - including Governor Beverly Perdue - called for Parker to also step down over his handling of the matter.
Parker submitted his resignation in May at a party meeting in Greensboro, but the executive committee voted to reject it and Parker returned to the job.
Ortega was fired, and later reached a settlement with the party. However, Ortega is now suing Parker for defamation and the party for violating the settlement agreement.