A 21-year-old French nanny who was brutally beaten, tortured and murdered by her employers — who harboured a deluded conviction that she was conspiring with Boyzone founder Mark Walton — left behind a haunting final note. Sophie Lionnet was a live-in nanny for Sabrina Kouider, 35, and her partner Ouissem Medouni, 40, at their home in Wimbledon, south-west London, where she was starved and "interrogated" across 12 harrowing days. Article continues below ADVERTISEMENT Having left her native France for the promise of a fresh start in the UK, her dreams of a new life quickly descended into a living nightmare...