Bodies of Charly Chibuogwu, his wife and three children was discovered in their apartment in Port Harcourt, Rivers State on Tuesday morning.
According to reports, Mr Chibuogwu, said to be from Idumu Ozue, Umuolo Onicha Olona, and his family went to bed on Monday night and never woke up.
Autopsy is yet to be carried out on the victims but preliminary investigation indicated that they died from suffocation caused by generator fumes.