Former MP MA Awal was taken to Keraniganj central jail on Wednesday evening in connection with the sensational Shahinuddin murder case in Pallabi.
Jailer Mahbubur Islam confirmed that he was taken to the jail at 7:30 pm and will be kept in a 14-day quarantine there.
MA Awal is a former member of parliament from the Lakshmipur-1 constituency.
On Thursday he was arrested by RAB along with others accused in this case.
RAB claimed the former MP to be the mastermind behind the murder.
On May 16, Shahinuddin was called up on his mobile phone and asked to go to Mirpur Section-12 on the pretext of resolving a land dispute.
When the victim reached the area around 4pm that day, the assailants attacked him before hacking him to death with sharp weapons in front of his seven-year-old son.
A murder case was filed at Pallabi Police Station on May 17 against several people, including former MP MA Awal.