Principal District and Session Judge, Prem Prakash Pandey convicted Lal Kisku, Gopal Tudu and Bidan Tudu and sentenced them to life imprisonment yesterday.
The court also slapped a fine of Rs.10,000 on each of them failing which they would have to undergo an additional year in prison.
The trio had beaten a bicycle thief Kolar Tudu to death at Pakuria on June 25, 2011.