Obinna in a letter written to the governor on Monday, May 20, said his resignation took effect immediately.
He said his resignation was due to “recent political development in our great party, PDP, Rivers state chapter, and my father’s position as regards to his call for your resignation as the Executive Governor of Rivers State.
“I wish to tender my resignation with immediate effect since it is only natural and incongruent to still remain in office.
“I, therefore, thank you very much for the opportunity you offered me to serve in your administration.”
Obinna’s father, Prince Emma Anyanwu, a chieftain of the PDP, had called on Amaechi to resign following the political crisis in Rivers.
Anyanwu said his call for Amaechi to resign was predicated on the governor’s alleged loss of the party structure that brought him into office and his inability to manage the political crisis.
Obinna was appointed by Amaechi in 2011.
Meanwhile, the state government has yet to react to the resignation of the aide as calls put to the spokesmen of the governor were not responded.