There's a lot of it about.
"Several mid-ranking Russian energy executives have died in unusual circumstances since the war broke out. A day after the invasion began in February, Alexander Tyulyakov, a deputy head of gas monopoly Gazprom’s treasury, was found dead in the garage of his home in Leninsky, an elite St Petersburg suburb. Investigators’ working theory was that Tyulyakov’s death was the second suicide in the same suburb in less than a month, after Leonid Shulman, an executive at Gazprom’s transport subsidiary, was found dead in his bathroom in late January.
In July, police found Yuri Voronov, the head of a shipping company that contracts for Gazprom dead in a swimming pool at his home in the same suburb near St Petersburg from a gunshot wound to the head. Russian media linked Voronov’s death to a business dispute and said Shulman was depressed after splitting up with his wife and suffering a serious leg injury.
In April, former Gazprombank vice-president Vladislav Avayev, his wife, and 13-year-old daughter were found shot dead in their Moscow flat. Police said Avayev probably killed his family in a murder-suicide but have not named a possible motive.
Just a day later, Sergei Protosenya, a former senior executive at gas producer Novatek, was found hanged in his villa in Spain alongside his wife and teenage daughter, who had been stabbed to death. Police also concluded Protosenya killed his family before hanging himself, according to Spanish media, despite finding no suicide note or fingerprints on the murder weapons. Protosenya’s son later said he believed his father was murdered. Novatek also appeared to cast doubt on the police findings by saying “speculations have emerged in the media about this topic, but we are convinced that these speculations bear no relation to reality”.
In May, a former Lukoil executive, Alexander Subbotin, died of a heart attack at a rented house in a downscale area in Moscow’s outskirts, according to investigators."