The body of a BJP worker was found inside the party office at Usthi in West Bengal's South 24 Parganas district, a police officer said on Saturday.
The worker, Prithviraj Naskar, used to handle the social media accounts of the party in the district.
The BJP pointed an accusing finger at the Trinamool Congress (TMC), while the police, after arresting a woman in connection with the killing, said the reason for the murder could be personal.