The prosecutors expect the arguments to be completed by Wednesday.
They said this was pre-planned murder as Sinha was shot even after the APBN saluted him.
During the arguments 15 accused including former OC of Teknaf police Pradeep Kumar Das were present at the court.
On the night of 31 July, 2020, Major (retd) Sinha was shot dead by police at Shamlapur checkpost in Teknaf’s Baharchhara.
On 5 August, Sinha’s elder sister Sharmin Shahriar Ferdous filed a murder case against nine people, including Teknaf OC Pradeep Kumar Das.
On 13 December, 2020, RAB brought charges against 15 people, including police source Ayaz and three APBN members, in connection with the murder.
A Cox’s Bazar court accepted the charge-sheet on 21 December, 2020.