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According to reports on Russian Telegram, Robertus felt he was being 'persecuted' and feared he was being set up to face a criminal investigation amid bitter feuding at the top level of the US-sanctioned company. He had held a meeting with his boss Oleg Pashaev where he probably got the bad news. A few hours later he was found dead in his washroom.
Previous causes of death among Lukoil executives include toad venom, 6th-story hospital window defenestration, and 'heart attack.'
Lukoil is the second largest company in Russia after Gazprom, but they made the unfortunate choice (for them) of criticizing Russia's war in Ukraine as bad for business. Since then it's been very bad for their top executives.
Source: Daily Beast