In his condolence message to Ray's wife Saraswati Swain, Mukherjee said in his death, the nation has lost a leader who was always in touch with the grassroots of the society.
"I am sad to learn about the passing away of your husband, Rabi Ray," he said in the message.
Mukherjee said as a freedom fighter, a veteran socialist leader and an eminent parliamentarian, Ray served the nation in various capacities including as the Union Minister for Health and Family Welfare and the Speaker of Lok Sabha.
Rabi Ray passed away at a Cuttack hospital yesterday after a prolonged illness. He was 91.
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