Special judge S Natarajan allowed the petitions filed by the Maran brothers seeking their discharge, holding that there was no prima facie case against them.
The central agency had alleged that Dayanidhi had caused a loss of 1.78 crore rupees to the exchequer. The judge had on March 9 reserved orders for today in the case.
The CBI had alleged that an illegal private telephone exchange was set up at the city residence of Dayanidhi during 2004-06 when he was the Telecom minister and it was used for the business transactions involving the Sun Network owned by his brother Kalanithi.
Other accused who have been discharged are former BSNL general manager K Brahmanathan, former deputy general manager M P Velusamy, Dayanidhi Maran’s private secretary Gauthaman, and Sun TV officials.