Mridul Bakshi, who was seriously injured in the blast on September 7, died around 4 AM, doctors at the Ram Manohar Lohia Hospital said.
Doctors said Bakshi had suffered multiple injuries on his head, chest, hands and legs.
Mridul, a resident of Okhla in south Delhi, is survived by wife and a six-month-old son.
His brother Vinod Bakshi said that Mridul, who was working in the marketing field, had gone to the High Court on that fateful day for some official work. Mridul was blessed with a child after six years of marriage.
While 13 victims of the blast have been recently discharged, 25 others continue to undergo treatment in different city hospitals.
Besides 12 patients who are now admitted with the RML Hospital, four victims are undergoing treatment at Safdarjung Hospital, five at AIIMS, two at Max Hospital and one each at Moolchand and LNJP hospitals.