The News Agency of Nigeria (NAN) learnt that the tragic incident involved the unmarried, but live-in couple.
They two cohabited and had a child.
According to neighbours, the sad incident occurred in the early hours of Saturday, at about 3 am, with the severed head of the victim discovered at dawn.
The residents subsequently apprehended Tony as he attempted to flee the scene.
He was subsequently handed over to the police.
ASP Musa Mohammed, the public relations officer of the state police command, who confirmed the incident, said the victim is in custody and undergoing interrogation.
It was gathered that policemen from Sagbama Division evacuated the remains of the victim and deposited it at the morgue of the Federal Medical Centre in Yenagoa. (NAN)