The CBI is likely to file charge sheet against DMK-owned Kalaignar TV and others in the second generation mobile telephony spectrum allocation scam later this week for allegedly receiving pay-offs for allocation of spectrum to certain telecom firms in January 2008 by jailed former telecom minister A Raja.

Agency officials said the charge sheet will give details of illegal routing of over Rs200 crore by his two close aides -- former managing director of DB Realty Shahid Usman Balwa and Sadiq Batcha (now dead), MD of Greenhouse Promoters -- to Kalaignar TV Pvt Ltd of which Tamil Nadu chief minister M Karunanidhi''s wife Dayaluammal is one of the owners.

They said Karunanidhi's daughter and DMK MP Kanimozhi, Dayaluammal and Sharad Kumar, managing director of Kalaignar TV, have 20, 60 and 20% shares in the channel respectively.

The CBI has informed the Supreme Court that the supplementary charge sheet will be filed before April 25 in the special court of Justice OP Saini and the probe in the case will be completed by May 31.

Raja and eight others including former telecom secretary Siddharth Behura and three telecom companies were on April 2 indicted in the second generation mobile telephony spectrum allocation scam by CBI, which pegged the loss to the exchequer at Rs30,984 crore.

The charge sheet has named former telecom secretary Siddhartha Behura, Raja's former PS RK Chandolia, Unitech MD Sanjay Chandra, Swan Telecom promoters Shahid Balwa and Vinod Goenka, Reliance ADA group's Gautam Doshi, Surendra Pipara and Hari Nair, Reliance Telecom, Unitech Wireless and Swan Telecom.

The comptroller and auditor general (CAG) has put the presumptive loss to the exchequer at Rs1.76 lakh crore in wrongfully leasing spectrum to telecom companies.