Irrigation expert R Vidyasagar Rao died at a private hospital in Hyderabad on Saturday, after a prolonged spell of illness.
The 77-year-old was also an Advisor to the Telangana government, and a close associate of Chief Minister K Chandrasekhar Rao.
Appointed soon after the bifurcation of the state, he was the chief advisor for all irrigation projects taken up by the state.
Reports add that Vidyasagar Rao played a key role during the Telangana movement, by highlighting the injustices done to the region, where sharing of water was concerned.
Vidyasagar Rao was born on November 14, 1939, and was a student of Osmania University, where he pursued his Bachelors degree. He went on to obtain a Masters degree in Water Resource Development from the University of Roorkee, and a Diploma from the Colorado State University.
Rao was also associated with the Central Water Commission (CWC) and the United Nations for a long time.
His death comes just a week after he was admitted to the hospital and put on ventilator, for cancer.
Telangana Chief Minister K Chandrasekhar Rao had also visited Vidyasagar at the hospital.
Several leaders paid their last respects to Vidyasagar on Saturday night.
This included Irrigation Minister T Harish Rao, TRS MP Kavitha Rao, Union Minister Bandaru Dattatreya, Leader of the Opposition in the Assembly K Jana Reddy, BJP Floor Leader G Kishan Reddy and Special Chief Secretary for Irrigation SK Joshi
The last rites will be performed on Sunday.
â€śVidyasagar Rao gave valuable advice to the TRS party and to myself, and thus remained a guiding force for the State. His vast experience in the field of irrigation has immensely helped the State after its formation, through re-designing of the irrigation projects. After Professor K Jayashankar, Vidyasagar Rao was the greatest personality that Telangana had, and Telangana will never forget him,â€ť KCR said in his condolence statement.
â€śSri Vidyasagar Rao was not only a good friend to me, but also an elder brother and a member of my family,â€ť he added.