Ramchandra Prasad died today at a hospital at Bengaluru after prolonged illness, party sources said.
Prasad(72) is survived by his wife, a son and four daughters.
Prasad, who was born at Pajana village of Mokama sub-division of Patna district in 1940, was chief whip of RJD in the state Legislative Council.
He was not keeping well and was in Bengaluru for treatment for past some months.
Chief Minister Nitish Kumar has expressed profound grief over death of Prasad and said he had deep interest in social and political activities and always worked for the uplift of the downtrodden.
Kumar also announced that he would be cremated with full state honours.
His body would be taken to Biharsharif tomorrow, his son said.
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RJD President Lalu Prasad condoled death of Prasad saying the party has lost a committed worker.
RJD MPs Premchand Gupta and Ramkripal Yadav, state JD(u) MLC and spokesman Neeraj Kumar also expressed sorrow at Prasad's death.