Sehgal(97), who was ill for some time, suffered a heart attack this morning at her residence in Civil Lines area here, Sehgal's daughter Subhashini Ali told reporters here.
A team of doctors has been appointed to monitor her health condition, she said.
Captain Lakshmi Sehgal was very active in the independence movement of India and commanded the 'Rani of Jhansi Regiment of INA, formed by Subhash Chandra Bose.
A doctor by profession, she was working as a medical practitioner and a social worker. She was awarded Padma Vibhushan in 1998.