The arrestee is Ashek Elahi, suspended additional sub-inspector of the police outpost.

Md Khaled Uz-Zaman, superintendent of Sylhet PBI, said that a team of PBI arrested Ashek from Sylhet Police Lines at night.

The arrestee will be produced before  a court today seeking remand, he added.

According to investigation, a police team, led by Ashek, detained Raihan and brought him to the police outpost on October 10.

On October 11, Raihan, 34, a resident of Akharia in Sylhet city, was beaten to death in police custody, said the victim’s family.

His wife Tahmina Akter Tanni filed a case at Kotwali Police Station the following day accusing a number of unidentified people.

Besides, the authorities on October 12 suspended four policemen, including the then in-charge of Bandarbazar Police outpost Akbar, in connection with the death.

Three policemen including Ashek were withdrawn  on the same day.

The case was transferred to the PBI.

Besides, the SMP formed an investigation committee, headed by its Additional Deputy Commissioner Shahrier Al Mamun, to look into the death of Raihan. After a primary investigation, they found some policemen guilty of foul play.

After the autopsy, doctors said they found 111 injury marks on Raihan’s body and two of his nails were pulled out.

On October 22, former SMP Commissioner Golam Kibria was transferred over widespread criticism of the role of police after the death of Raihan.

Also read: None involved in Raihan killing will be spared: SMP Commissioner