The alleged killers are moving freely, campus sources claimed.

Rafiqul Islam Patwary Liton was vice-president of Sust unit of Jatiyatabadi Chhatra Dal (JCD), student front BNP.

Hailing from a village in Chagalnaiya upazila in Feni district, Liton was the only brother of five sisters. He lost their father in his boyhood.

Liton, a student of Masters in Social Science, was beaten in front of hundreds of students and teachers near the administrative building on July 13, 2005. It was the first political killing on the Sust.

As he came out of examination hall at about 5 pm, a group of JCD cadres swooped on him near the Gol Chattar on the campus. They hit him with iron rods and hockey sticks and took him to the employees' canteen, where they beat him again, leaving him unconscious.

Sources said earlier that hundreds of students and teachers witnessed the incident, but none dared to some to his rescue.

Liton was rushed to nearby Ragib-Rabeya Medical College and Hospital, wherefrom he was shifted to Osmani Medical College and Hospital.

He died after hours.

The Sust authorities filed a case with Kotwali police station. But there has not been any meaningful progress in the investigation, sources claimed.

The Sust authorities expelled 13 students for one or two semesters, which some sources claimed to be a lenient punishment. Most of them are backed on the campus on expiry of their expulsion periods.