Lam Kok, the 46-year-old head of the Hong Kong-based Brilliant group, had just bought a major Bordeaux vineyard in a sale accompanied by great fanfare and was surveying his new property in a helicopter piloted by the former owner when the accident happened yesterday.
Emergency workers pulled a still-unidentified body from inside the helicopter after finding the wreckage in the Dordogne river, said local officials.
A large search operation was called off just before midnight with the helicopter's other three occupants still missing. Officials said the search would resume today morning.
Lam Kok's wife pulled out of the aerial tour at the last minute, saying she was "scared of helicopters", said an AFP photographer at the event. Gregoire meanwhile patiently carried out his pre-flight procedures, a check-list resting on his knees, the photographer said.
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The accident happened at the end of a festive day marking Thursday's sale of the Chateau de la Riviere, one of the region's oldest estates.
After a press conference, an introduction to the staff and dinner, the former owner was planning to take his buyer on a short tour of the 65-hectare vineyards and surrounding grounds.
A major search operation was launched using emergency helicopters, inflatable boats, rescue divers and around 100 officers on foot. Emergency workers managed to locate the wreckage in the river after police received a call from a witness who had seen the helicopter go down.
In a bizarre twist of fate, a previous owner of the Chateau de la Riviere was killed in a plane crash in 2002.