The president appointed James Kueth Makuach to replace Mr Nyang, a card-carrying member of the Sudan People’s Liberation Movement in Opposition (SPLM-IO).
Nyang, now a former commissioner, was on an indefinite suspension imposed by the state authorities after he was accused of violating international migration laws by leaving his work station and crossing the border into Ethiopia without obtaining permission from the state authorities.
The state government also claimed that Deng hosted the Commissioner of Pangak County at the Akobo County Headquarters without notifying the state authorities.
In protest, the SPLM-IO condemned the suspension and urged the administration of Gai to reinstate the commissioner.
The Presidential Decree read on SSBC Tuesday evening means the protest has been in vain, as the commissioner received the final blow to his administrative hopes.