In 2005 she got another breakthrough and signed on to play the lead role in Kannamma scripted by Karunanidhi, but to do so she unceremoniously opted out of another film titled Ullakadathal.
He is also the grandnephew of DMK president and ex-chief minister of Tamil Nadu, M Karunanidhi.
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In May 2007 the Tamil daily newspaper, Dinakaran, owned by his brother Kalanidhi Maran, published a survey whose results declared that 70% of the people of Tamil Nadu favoured Karunanidhi's younger son M.K. Stalin as his likely successor as against 2% for Stalin's elder brother M.K. Azhagiri.
Ramanathan received first prize in a state level recitation competition organized by Murasoli Arakattalai in 2002 and was felicitated by Mr. M. Karunanidhi, ex Chief Minister of Tamil Nadu and a highly recognized figure in the field of Tamil Literature.
His mother is the sister of former Tamil Nadu Chief Minister M Karunanidhi.
Muthuu is the first son of five time chief minister M. Karunanidhi.
Upon a Government order issued by Chief minister M. Karunanidhi, on 25 December 2008, Dalits led by the district collector G Prakash and Superintendent of Police Asra Garg entered the temple despite the protest and resentment of non-Dalits, following which it is to remain open and poojas be performed on a regular basis by all.
Chief Minister of Tamil Nadu state M. Karunanidhi and several other political personalities condoled his death.
M. Karunanidhi was arrested at midnight by the police at later produced before Ashok Kumar around 4-30 a.m. and was remanded to judicial custody.
He was considered as one of the best film script writers of Tamil Cinema, and was hailed as such by noted screenwriters like C. N. Annadurai and M. Karunanidhi publicly.
It was claimed as a mark of protest against his father Karunanidhi's decision to pull out from the central ministry.
He is the third son of famous politician of Tamil Nadu, Karunanidhi, and was born to his second wife, Mrs. Dayalu Ammal and was named after Joseph Stalin (who died later that week).
All these similarities had led to more recent comparison of the LTTE leader, Vellupillai Prabhakaran,to him by present day Tamil nationalists, Karunanidhi ex Chief Minister of Tamil Nadu in his book, Payum Puli Pandara Vanniyan, and Nedumaran.
Famous people who have at one time or another lived in the bachelor pads of Triplicane include political figures Periyar, Annadurai and Karunanidhi.