Rapid Action Battalion (Rab) has arrested a death row convict in a case filed over the killing of former Awami League MP Manjurul Islam Liton.The arrestee is Chandan Kumar Roy, the main coordinator of the murder.A team of Rab-3 and Rab-6 jointly conducted a drive in the Bhomra area of Satkhira and arrested Chandan around 9:30pm on Sunday, said ASP Imran Khan,Media wing of Rab headquarters.Liton, a former MP from Gaibandha-1 constituency, was gunned down by miscreants at his village home in Masterpara of Sundarganj upazila on December 31, 2016.Liton’s sister filed a case against several people at the Sundarganj Police Station.Detectives arrested Quader, a former Jatiya Party MP from Gaibandha-1 constituency, on February 21, 2017 from his home. Five days later, he confessed before a court to his involvement in the killing.On April 30, 2017, police submitted a charge-sheet against eight people, including Quader, who had previously been sentenced to life imprisonment in a separate case filed under the Arms Act.