Dmitriy Zelenov

Died while visiting friends in Antibes, a coastal city in France. According to French newspaper Var Matin: "Mr Zelenov died after tumbling from a flight of stairs on December 9. He was having dinner with friends when Mr Zelenov suddenly became unwell, falling down a flight of stairs and suffering critical injuries." He died without regaining consciousness.

Before suffering colossal losses in the past few years, Mr Zelenov's fortune was estimated to be $1.4 billion, according to Forbes.