Before going missing on April 7, Chatterjee had written a letter to party boss Provas Ghosh, accusing him of deviating from the party ideology by joining hands with the Trinamool Congress. “In this situation, I have decided to finish myself,” he had said in the letter. Three days later, his body was found hanging in a hotel room in Puri.

The police claim that Chatterjee committed suicide but they are undecided whether to treat his letter as a suicide note and bring abetment charge against Provas Ghosh.

“An investigation is on. There is no new development. We are yet to decide whether to treat his letter as a suicide note,” said Pravin Kumar, Superintendent of Police, South 24 Parganas.

A postmortem was done after the body was handed over to the West Bengal Police. The police are yet to throw light on the entire chain of events starting from Chatterjee’s writing the letter to his death. Handwriting experts were called in to verify the authenticity of the letter, but the police are yet to get their report.