Early years (1908–1936)

The son of Chandi Prasad Singh, an erstwhile Indian prince and a prominent criminal lawyer, K.N. Singh was a sportsman who once dreamt of being in the army. Born in Dehradun, Singh was expected to follow in the footsteps of his father and become a lawyer. However, his father's skillful defence, which saved an obviously guilty man from the gallows, turned him away from the profession.^[1]

Turning his energy to sports, K.N. Singh came to excel in the javelin throw and the shot put. He was selected to represent India in the 1936 Berlin Olympics before circumstances compelled him to go to Calcutta to attend on his ailing sister. There he met his family friend Prithviraj Kapoor, who introduced him to director Debaki Bose, who offered him a debut role in his film Sunehra Sansar (1936).

Popular villain (1936 to late 1960s)

K.N. Singh enjoyed limited success until the release of Baghban (1938), in which he played the antagonist. Baghban was a golden jubilee hit, establishing Singh as one of the leading villains of the era.

Through the 1940s and 1950s, Singh appeared in several iconic movies of the era, including Sikandar (1941), Jwar Bhata (1944) (Dilip Kumar's film debut), Humayun (1945), Awara (1951), Jaal (1952), CID (1956), Howrah Bridge (1958), Chalti Ka Naam Gaadi (1958), Amrapali (1966) and An Evening in Paris (1967).

As opposed to playing angry mobsters, he mostly played a white collared gentleman villain, dressed in a fine suit and smoking a pipe, with a calm cold delivery.

His suave style, baritone voice and menacing eyes became legendary – so much so that on one occasion (in his own words) "Even off-screen I was a bad man. One day on my way back from shooting, I had to deliver an envelope at an address given to me by my friend. I pressed the doorbell and, from the moving curtains, I could see a woman hurrying to open the door. When she saw me standing in front of her, she screamed out in fright and ran inside leaving the door open."^[2]

As an actor, Singh's thirst for learning was legendary. For example, he studied the style and mannerisms of carriage riders to prepare for the role of a horse carriage driver in Inspector (1956).^[3]

Later years (1970 to late 1980s)

Singh played prominent roles in movies such as Jhoota Kahin Ka (1970), Haathi Mere Saathi (1971 film) and Mere Jeevan Saathi (1972 film). His last prominent role was in the 1973 film Loafer (1973 film).

With advancing years, Singh became less active, particularly from the mid 1970s onwards. Many of his roles from the late 1970s onwards were mere cameo appearances, arranged with the sole purpose of ensuring that actors turned up on time – such was his stature that actors would never turn up late when K.N. Singh was on the set.^[4] His last appearance was in Woh Din Aayega (1986).