Laureline Garcia-Bertaux was discovered naked, bound, wrapped in bin bags and buried in a flower bed in her back garden.
He closed his eyes and nodded at the jury as the verdict was delivered, and will be sentenced on Friday.
He said he had worked on the Hollywood blockbuster World War Z starring Brad Pitt, but his name was not listed on the film's credits. The court heard he had met Ms Garcia-Bertaux in 2009 but the couple split up eight years later. She had complained he was a"slob" who would"needle her about her weight".
Mr Glasgow claimed her death was not the result of a panicked moment of anger or the frantic result of a heated row - and instead was done"calmly and methodically", with Belorusov later captured on CCTV shopping for items to dispose of her body.
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