A Biju Janata Dal (BJD) leaderand former MLA from Odisha was arrested by police in Raigarh district of Chhattisgarh in connection with murder of a mother-daughter duo in 2016, police said.Anup Sai was placed under arrest after he admitted during his interrogation at Chakradhar Nagar police station in the district on Thursday that he had killed the woman and her minor daughter, Raigarh Superintendent of Police Santosh Singh said.On May 7, 2016, Raigarh police had recovered disfigured bodies of a woman and a girl from Chankaradharnagar area on Raigarh-Odisha road, he said.The deceased were later identified as a divorcee Kalpana Das (40) and her daughter Babli Das (14) from Surajpada in neighbouring state.During the investigation, the involvement of Sai in the offence was came to light, following which he was recently summoned by the police for interrogation, he said.He was booked under IPC sections 302 (murder), 201 (causing disappearance of the evidence) and 120B (criminal conspiracy) of the IPC, Singh said, adding that further probe in the case is underway.According to police, Sai was in illicit relationship with the woman and killed her after she allegedly started blackmailing him.Sai, who was elected as an MLA three times from Briajrajnagar in Odisha's Sundargarh district, is currently the chairman of Odisha State Warehousing.He was in Congress before joining the BJD in 2014.