The marriage proved ill-suited and the couple soon grew apart. "There is no strong evidence as to what had precipitated the quarrels they've had. There are reasons to believe Yuri had grown tired of his wife's nervousness and frail health, and his mother-in-law's despotic ways," according to literary historian and Lermontov scholar Alexander Skabichevsky. An earlier biographer, Pavel Viskovatov, suggested the discord might have been caused by Yuri's affair with a young woman named Yulia, a lodger who worked in the house. Apparently it was her husband's violent, erratic behavior and the resulting stresses that accounted for Maria Mikhaylovna's early demise. Her health quickly deteriorated and she developed tuberculosis and died on 27 February 1817, aged only 21.