"Me, wife Asha, party MLA Harkabahadur Chettri and all others in the Morcha are innocent and we are victims of a conspiracy," Gurung told a hastily-called press conference here.
The GJM leader, who however refrained from elaborating on the conspiracy, said, "We have faith in the judicial system and let the truth come out about the murder."
The press meet was also attended by other Morcha leaders.
The charge sheet also named Asha, GJM MLA from Kalimpong, Harkabahadur Chettri, Assistant General Secretary of GJM, Binoy Tamang, GTA Chairman Pradeep Pradhan, deputy chief executive of GTA Col Ramesh Allay and 16 others for criminal conspiracy, murder and other charges.
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Prime accused in the case, Nickol Tamang had, however, disappeared mysteriously from Pintail village near Siliguri, where he was being held by state CID, on August 21, 2010 for interrogation following his arrest.
The High Court had then directed the CBI to take up the Madan Tamang murder case and the Nickol Tamang disappearance case.
Madan Tamang had been hacked to death at Upper Clubside in the heart of Darjeeling town on May 21, 2010 when he was overseeing preparations for a public meeting.