"This is an irreparable loss to the Congress party. My love and support to his family in this hour of grief," Gandhi said on Twitter.
Kadam, who was undergoing treatment at a hospital in Mumbai, passed away tonight, family sources said.
He was 72 and is survived by his son Vishwajeet Kadam.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)