Chinese tea tycoon Lam Kok feared dead in Dordogne helicopter crash that killed son Chinese billionaire... Lam Kok and his wife pose in front of the Chateau de La Riviere less than an hour before the fateful helicopter ride. Picture: Mehdi Fedouach/AFP Source: AFP RESCUE teams are scouring the Dordogne river in southwestern France after a helicopter carrying a Chinese tea tycoon overflying his newly-purchased vineyard went down. The body of Lam Kok's 12-year-old son was pulled out of the river late on Friday and there was little hope that the businessman, the French winemaker who sold him his chateau and their interpreter could have survived. On Saturday, four dinghies were scanning the water near the site of the crash as divers went under and police dogs combed the river bank, an AFP photographer reported. Police said mangled parts of the chopper's fuselage had been retrieved, but strong currents were complicating the search for the three missing. The owner of the Brilliant group had celebrated his purchase of the Chateau de la Riviere, one of the region's oldest estates, with a lavish event on Friday. After a press conference, an introduction to the staff and dinner, former owner James Gregoire was planning to take his buyer on a short tour of the 65-hectare vineyards and surrounding grounds. Lam Kok's wife pulled out at the last minute, saying she was "scared of helicopters." Rescue effort... So far only the body of Lam Kok's 12-year-old son has been recovered from the crash site. Picture: Julie Bruhier/AFP When the four did not return after 20 minutes, employees at the vineyard contacted emergency services. In a bizarre twist of fate, a previous owner of the Chateau de la Riviere was killed in a plane crash in 2002. Gregoire bought the property, the largest in Bordeaux's Fronsac wine-producing region and close to the prestigious Saint-Emilion and Pomerol, the following year. Hong Kong-based Brilliant, which specialises in rare teas and luxury hotels in China, had said it wanted to turn the chateau into a high class tea and wine tasting centre. New owner... Kok poses with the chateau's former owner James Gregoire, who was also on the flight. Picture: Mehdi Fedouach/AFP