A court has placed Al Amin Jony, the prime accused in the case over the killing of a woman and her son in the city's Kakrail area, on 6-day remand.
Dhaka Metropolitan Magistrate Ahsan Habib passed the order on Sunday after Ali Ahsan, sub-inspector of Ramna Police Station and also the investigation of the case, produced Jony before the court seeking a 10-day remand.
Members of Rapid Action Battalion (Rab) on Saturday arrested him from Gopalganj district.
During preliminary interrogation Jony confessed to his involvement in the double murder.
On Wednesday, Shamsun Nahar, 40, wife of Abdul Karim, and their son Shawon, 22, were found dead at their flat in a multi-storey building in the city's Kakrail area.
On information, police went to the spot and recovered their bloodstained bodies.
Ashraf Ali, brother of victim Shamsun Nahar, filed the case with Ramna police station on Thursday night accusing Abdul Karim, 56, husband of victim Shamsun Nahar, his third wife Sharmin Akhter Mukta, 25, Mukta's brother Al Amin alias Jony, 33.