Russian energy tycoon and oil oligarch mysteriously dies
The energy tycoon was the husband of the daughter of the ex-president of the Russian Federation Boris Yeltsin. 
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction: Russian energy tycoon and oil oligarch mysteriously dies

### Response: The energy tycoon was the husband of the daughter of the ex-president of the Russian Federation Boris Yeltsin. 