Obsessions of accused nanny killers

A couple accused of murdering their nanny had refused to let the victim return to France because they were convinced she was plotting with former pop star Mark Walton, a court heard. Sabrina Kouider, 35, and Ouissem Medouni, 40, tortured Sophie Lionnet as she demanded to know where Walton was living, claiming the 21-year-old victim had slept with him there. Kouider was the ex boyfriend of the Pop Idol Vietnam judge and was obsessed with him. Ms Lionnet was beaten…