After learning about his demise, several leaders including the President and the Prime Minister have paid tribute to the departed soul and expressed their condolences to his family.
Sibal, a renowned lawyer and former Union minister, was a crucial part of G23 leaders in the Congress party who dissented against the central leadership.
The stunning development has become the talk of the town after the minister's third wife has filed a case against him for allegedly assaulting and divorcing her.
Hours before breathing his last, Amar Singh had posted messages on Twitter wishing people on Eid and paying his tributes to Bal Gangadhar Tilak on his 100th death anniversary.