Vikas, son of actor Ghanshyam Nayak, who played 'Natu Kaka' on the TV serial 'Taarak Mehta Ka Ooltah Chashmah', said the late actor had forgotten his own name during his last days. "On October 2, he asked me, 'Who am I?'...That is the time I realised that he'd started going into the other world," Vikas told The Times of India.