The Hindu Samajwadi Party leader Mohan Singh. Photo: R.V. Moorthy Samajwadi Party (SP) general secretary and Rajya Sabha member Mohan Singh, who was recently removed from the post of party national spokesman over differences with Chief Minister Akhilesh Yadav, passed away at AIIMS on Sunday after a prolonged battle with cancer.Mr. Singh, 68, was admitted to AIIMS on September 18, SP spokesman Rajendra Chaudhary. Mr. Singh is survived by his wife Urmila and two daughters.AIIMS medical superintendent P.K. Sharma said, “Singh was suffering from blood cancer.”“Two days back his condition became serious and he was shifted to ICU. He died at 4:15 p.m. today.”His body will be taken to Lucknow on Monday and put in party office at Vikramaditya Marg, SP general secretary Ram Gopal Yadav said.Later, the body will be taken to Gorakhpur and then to his ancestral village Jainagar in Deoria for the last rites.“After the demise of Janeshwar Mishra and Brij Bhushan Tiwari, the demise of Mohan Singh is a setback for the socialist movement. He was a man of principles and his death has left a void in the Samajwadi Party,” Mr. Ram Gopal said.SP supremo Mulayam Singh Yadav, Uttar Pradesh Chief Minister Akhilesh Yadav, U.P. Assembly Speaker Mata Prasad Pandey, LJP leader Ram Vilas Paswan and several party leaders have condoled his death.On January 6, 2012 Mr. Singh was removed from the post of SP national spokesman after he disagreed with Mr. Akhilesh Yadav’s decision to keep controversial leader D.P. Yadav out of the Samajwadi Party, who accused party leadership of dictatorship.