A senior police officer said TMC activist Injul Seikh died on the spot after being hit by a stray bullet when he was passing by the Sujapur locality under Kaliachak police station area on motor-cycle.
The area, close to NH 34, often witnessed clashes between two groups over turf control.
The death triggered tension as local people blocked NH 34 for a long time paralysing vehicular traffic.
The crowd was later pacified by senior police officers.