Additional District and Sessions Judge Subhradip Mitra, who had convicted all the 35 accused yesterday, pronounced the quantum of punishment today.
According to prosecution, Jainal Abedin and another man were attacked by a group of villagers in the wee hours of September 5, 1996, over a dispute among them.
The attackers used sharp weapons and bombs to critically injure Abedin who later died at a hospital. However, his companion managed to escape.
Altogether 37 persons were arrested in connection with the case and two of them died during the course of trial.