Ex-girlfriend of Boyzone founder ‘murdered French nanny and burnt her body’

  The ex-girlfriend of Boyzone founder Mark Walton murdered a French nanny and burnt her body after accusing her of a series of ‘outlandish’ crimes she had not committed, a court heard. Sabrina Kouider, 35, allegedly killed ‘naive and vulnerable’ 21 year-old Sophie Lionnet after a ‘brutal and oppressive inquisition’, the Old Bailey was told. Kouider and partner Ouissem Medouni, 40, held the victim prisoner at their £900,000 home in Wimbledon, southwest London, in the days before her death, jurors…