He breathed his last at the B L Kapur hospital around 7 pm, sources close to the family said.
Rajinder Kumar Dhawan, a former Union minister, was admitted to the hospital last Tuesday for age-related ailments, they said.
"Our homage to veteran Congress leader, Sh. R.K.Dhawan, who breathed his last today. His tireless spirit, immeasurable commitment & untiring dedication to the Congress ideals will always be remembered. RIP," Congress communications in-charge Randeep Surjewala tweeted.
"Deeply shocked at passing away of Shri RK Dhawan. Though he was ailing I had never expected that the end will come so soon. A close associate and colleague in Party and Government, he will forever be fondly remembered," Mukherjee tweeted.
During his years as Indira Gandhi's personal secretary, from 1962 to 1984, Dhawan reportedly wielded immense clout, with some claiming that he controlled information and access to the then prime minister. During the Emergency years (1975-77), Dhawan was among Indira Gandhi's inner circle of leaders.
After Rajiv Gandhi took over the reins of the Congress party and the government following his mother's assassination, there was talk of Dhawan being sidelined.
However, later Dhawan returned to party affairs and was elected to the Rajya Sabha in 1990. He had also been a member of the Congress Working Committee.
He was appointed Minister of State (independent charge) Housing and Urban Development (1995-1996).
Dhawan also served as a member on various parliamentary committees.
He tied the knot at the age of 74 with Achla in 2011. He is survived by his wife.
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