Justice Oyindamola Ogala of the Lagos State High Court, Ikeja, found Nwankwos guilty of conspiracy and manslaughter.
The judge delivered judgment in police suit no ID/13178C/20 against the husband and wife.
Justice Ogala held that the prosecution proved the charges of manslaughter, conspiracy and attempt to pervert justice and misconduct beyond doubt.
The judge said the testimonies of the prosecution witnesses were strong and corroborated the fact that the maid died due to the beating by Fortune.
The first defendant, according to Justice Ogala, assaulted Joy which caused her death as she had not been feeling well before that day.