1x9 - Snowdrop

Igor's father, who is in hospital is confronted by his wife. She accuses him of robbing her off of her happiness, even though she tried to make his life happy, also that she made ample efforts to take care of his family. She takes off his oxygen pipe and watches him die because of it. Meanwhile, the doctor arrives but by then it is too late. Igor learns of his father's demise when he was dicussing about Nadya's involvement with his sister Rita.