Khan was suffering from Progressive Supranuclear Palsy, a degenerative disease that causes loss of balance, difficulty in walking and dementia. He had developed breathing issues and the doctors had reportedly transferred him from regular ventilator to BiPAP ventilator, a private news channel reported. He born in Kabul, Khan made his acting debut in 1973 with Rajesh Khanna's Daag and had featured in over 300 films. He wrote dialogues for over 250 movies. Before becoming an actor, he had written dialogues for Randhir Kapoor-Jaya Bachchan's Jawani Diwani.
Khan went from playing the role of a villain in films like Farz Aur Kanoon, Jeeo Aur Jeene Do, Naya Kadam and Qaidi to winning hearts with his comic timing in Hum, Bol Radha Bol, Aunty No 1 among others. As a screenwriter, Khan frequently collaborated with Manmohan Desai and Prakash Mehra. His films include Dharam Veer, Ganga Jamuna Saraswati, Coolie, Desh Premee, Suhaag, Parvarish and Amar Akbar Anthony, Jwalamukhi, Sharaabi, Lawaaris and Muqaddar Ka Sikandar. Khan is survived by his wife Hajra, son Sarfaraz, daughter-in-law and grandchildren.