Kwok was the oldest of three sons who inherited the fortune of Kwok Tak-seng, a grocery wholesaler from Guangdong province, China, who immigrated to Hong Kong after World War II.
Walter, also known by his Chinese name Ping-sheung, was kidnapped in 1997 by a Hong Kong gang leader nicknamed “Big Spender,” who also held Hong Kong billionaire Li Ka-shing’s son Victor Li for ransom.