Rab has arrested a woman in connection with the killing of Notre Dame College student Yougen Hanasie Gonsalves.
Sakhina Begum Sabita, 26, an intern lawyer at Judge Court, was arrested from Dhaka's Mugda area on Saturday night, Rab said.
Sabita is the woman seen in CCTV footage -- accompanying Yougen to the flat in Sabujbagh from where his body was found -- around 3:30pm on the day of the murder, said Lt Col Emranul Hasan, commanding officer of Rab-3.
Rab said Yougen got acquinted with Sabita in 2013.
During primary interrogation, Sabita said she made Yougen a witness in a rape case she filed with Shahbagh Police Station against another lawyar in 2017. Yougen used the opportunity and extorted money from her, threatening to refrain from giving testimony in the court, Rab officials quoted Sabita as saying.
Recently, Yougen proposed renting a flat together, saying that the lawyer accused in the rape case filed by Sabita may harm them.
On January 15, Sabita rented the flat in Sabujbagh, Emranul said.
Sabita claimed that she was infuriated with Yougen as he regularly demanded money from her for drugs. She bought a kitchen knife and kept it in the rented flat, Rab quoted her.
On February 12, Sabita, clad in a burka, took Yougen to the flat. While he went out for a while, she put sedative in juice and prompted him to drink it upon retrun, the Rab official said.
Once the sedative kicked in, Sabita tied Yougen up, stabbed him indiscriminately with the kitchen knife, and fled wearing salwar-kameez, she told Rab.