Sehgal (97), breathed her last at a private hospital at 11.20 AM, her daughter and noted CPI (M) leader Subhashini Ali said.
Sehgal, who was ill for some time, was admitted to the hospital on July 19 after she suffered a heart attack at her residence in Civil Lines area here. She was kept on life support system.
She was very active during the Independence movement and had commanded the 'Rani of Jhansi Regiment' of the INA formed by Bose.
A doctor by profession, Sehgal was working as a medical practitioner and a social worker. She was awarded Padma Vibhushan in 1998.
Born as Lakshmi Swaminathan to noted lawyer Dr S Swaminathan and social worker Ammu Swaminathan in Chennai on October 24, 1914, Sehgal obtained her MBBS degree from the Madras Medical College in 1938.