The chairman of Lukoil oil giant, Ravil Maganov, who has been critical of the Russian war in Ukraine, has died from a classic case of Russian window cancer after falling from a hospital window in Moscow. Via BBC.com:

The company confirmed his death but said only that Maganov, 67, had "passed away following a severe illness".

Russian media said he was being treated at Moscow's Central Clinical Hospital and died of his injuries.

[...] Investigating authorities said they were working at the scene to establish how he died. Tass news agency quoted sources saying he had fallen out of a sixth-floor window, adding later that he had taken his own life.

It is a sad coincidence of a sort that seems very frequent for prominent Russians:

The body of millionaire Novatek former manager Sergei Protosenya was found alongside his wife and daughter at a Spanish villa in April.

A former vice-president of Gazprombank, Vladislav Avayev, was found dead with his wife and daughter in their Moscow flat, also in April.

In May, a former Lukoil tycoon Alexander Subbotin died of heart failure, reportedly after seeking alternative treatment from a shaman.