[Daily Mail, where America gets its news] - Sergey Protosenya, 55, is believed to have carried out the murder-suicide
- He was found hanged in the courtyard of his holiday home in Spain, and his wife Natalia and their 18-year-old daughter were found murdered inside
- Police are reportedly working to the assumption he killed them before taking his own life. However, reports suggest the evidence is not conclusive
- It comes after another Russian businessman, Vladislav Avayev, 51, was found dead in Moscow with his wife Yelena, 47, and their younger daughter Maria
- Both men, found just one day apart, had separate links to Russian gas companies
- Protosenya, who had a fortune of over £330 million, was Deputy Chairman on the Board of Directors for natural gas company Novatek for seven years
- Avayev was previously a vice president at Gazprombank - a bank that was created to work for Russian gas giant Gazprom - and had also been a Kremlin official
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