Was Sophie killed in Boyzone blackmail plot?

A delusional French couple jailed for 30 years for torturing a nanny to death may have been trying to get confessions to blackmail former Boyzone star Mark Walton. Sabrina Kouider, 35, and Ouissem Medouni, 40, spent over a month extracting false confessions from terrified 21-year-old Sophie Lionnet about Mr Walton, a founding member of the boy band. Kouider became obsessed with the idea that Walton – who she dated for two years – was spying on her, sleeping with the…