South Dinajpur police on Thursday filed a murder case in the death of Swadhin Roy, a booth committee president of the BJP in the district’s Gangarampur, after his wife formally complained that he was murdered.

The police have detained two persons for interrogation.

On Wednesday morning, Roy was found dead in a deserted field, his bike nearby.

Police sent the body for autopsy. Senior policemen said prima facie Roy was drunk and could have died from falling off his bike. His last rites were held on Wednesday evening in the presence of the police.

BJP leaders, including Balurghat MP Sukanta Majumdar, called it murder by strangulation and blamed Trinamul.

On Thursday, state BJP leader Sayantan Bose and district leaders reached Roy’s house. Roy’s wife Beli and party leaders then went to Gangarampur police station, where Beli filed the murder charge and said her husband wasn’t in the habit of drinking.

BJP leader Bose echoed the Balurghat MP to say that Roy had been strangled to death. “This is a new killing technique that Trinamul-backed goons have adopted to conceal their crime. The post-mortem and last rites were conducted in a hurry and we suspect that a section of police officers have done it in connivance with Trinamul,” he said.

Asked to comment, Gangarampur’s inspector in charge was brief in his reaction.

“We have filed a case based on a complaint by the deceased’s wife. Two persons have been detained for interrogation. Our officers are probing the case,” said Purnendu Kundu, the inspector-in-charge.