Telugu Desam Party leader Nandamuri Taraka Ratna, who was undergoing treatment here at Narayana Hrudayalaya, passed away on Saturday, family sources said.Taraka Ratna (39) was admitted to the hospital after he suffered a massive heart attack during a political rally in Chittoor in the neighbouring Andhra Pradesh.He had collapsed while participating in the launch of the state-wide 'padayatra' of TDP General Secretary Nara Lokesh on January 27 at Kuppam.