Family members of Adhir Maity, the slain Trinamool Congress supporter, demonstrated before the Alipore court and demanded that Kow, who was arrested on April 4 from Balia district in Uttar Pradesh, be punished.
Kow, on the run since the violence, had earlier taken refuge in Odisha and Jharkhand. He was brought here on transit remand by train and interrogated at the Lalbazar police headquarters.