The deceased, Ogah Ochigbo, was said to be plying a one-way road when he was stopped by the police.
According to the Guardian, an altercation ensued and in the heat of it, the policeman shot the NSCDC officer right in the presence of his wife and children.
He was confirmed dead at Asokoro District Hospital, Abuja where he was taken after the incident.
UPDATE: NSCDC officer was not shot dead - Police
The spokesperson of the Nigeria Police Force, ACP Frank Mba, has disclosed that the two offending officers are traffic wardens and did not bear arms.
He said the deceased was not shot dead, but instead suddenly collapsed and died at Nyanya Police Station where he had been taken for questioning over his traffic offence.
He said, "On contravention, the NSCDC officer himself, who was putting on a civil shirt on top of his NSCDC trouser, drove himself with the traffic warden officers to the Nyanya Police Station. It was while he was being asked questions and he was responding that he suddenly collapsed.
"On getting to the hospital, he was confirmed dead. The corpse has been deposited at the Maitama General Hospital. An autopsy will be conducted on the corpse in the presence of his family particularly, his wife and doctors from the NSCDC to determine that cause of death and it will be made public."
He also disclosed that the two traffic warden officers have been arrested and will be investigated over the incident.