Santu Ghosh was shot outside his home at Chakdaha on Friday night and was declared brought dead at a hospital. A political blame-game on the issue has erupted between the BJP and Trinamool Congress.
"Bharat Biswas, 25, alias Pochan was arrested on Saturday. He was produced at the court on Sunday," said a senior officer of Nadia district.
Asked whether the incident has any political link, the officer said that the police "didn't find any political connection in the preliminary stage" of investigations into the murder.
While being taken to court, Biswas told reporters that he was present at the spot on the day of the murder but was busy surfing on his mobile phone.
"I fled from the area when a boy named Laltu shot Shantu. I was very scared," he said.
"The accused was known to the deceased. As for the rest, everything is under investigation," the officer said.
Claiming that Ghosh had defected from Trinamool Congress, BJP activists blocked a national highway and railway tracks for about two hours on Saturday, causing major disruption of train services in the Sealdah division.
BJP state unit chief Dilip Ghosh also claimed that the deceased party worker was targeted by the Trinamool as he had worked hard for the saffron party during the Lok Sabha polls.
When asked about the incident, West Bengal Chief Minister Mamata Banerjee blamed it on infighting in the BJP.
( With inputs from IANS )