The body of Prasenjit Nag, aged about 38 years, was found inside a downstairs room of his residence, a senior officer of Bidhannagar Police Commissionerate said.
Sniffer dogs, forensic experts inspected the place as police started a suo moto case in the matter.
It was found that the call list on Nag's mobile phone, which was recovered from the room, was deleted, the officer added.