45-year old Mahadevan jumped into the river from the Kotturpuram Bridge and his body had been found, police said.
Police said they were ascertaining the reason behind Mahadevan's extreme step.
Nithyashree is a very popular name in the classical music circles and the grand daughter of the late D K Pattammal, a renowned singer who was often hailed as one of the trinity of carnatic vocalists -- the other two being late M S Subbulakshmi and the late M L Vasanthakumari.