Case 236

Sophie Lionnet

*** Content Warning: abuse ***

When residents of the affluent Southfields area of south-west London notice foul smelling smoke coming from a home on Wimbledon Park Drive in September 2017, firefighters arrive to make sure the house isn’t in danger. Nothing could prepare them for what they find instead – the burning human remains of French au pair, 21-year-old Sophie Lionnet. 

Suspicions are immediately cast on Sophie’s employers, socialite Sabrina Koudier and her long-term partner Ouissem Medouni. But why would the stylish couple want to harm their young nanny? And what does former boy band member Mark Walton have to do with it? What emerges is a tale of lies and blackmail so extreme that it beggars belief.



Casefile Presents



Research & writing – Elsha McGill

Creative direction – Milly Raso

Narration – Anonymous Host



‘Flatline intro’ and ‘Come play with me’ intro and outro –

Audio production – Mike Migas 

Scoring – Mike Migas and Andrew Joslyn



Logo and website design – Paulina Szymanska



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Medouni & Anor V Regina



Stranger Than Fiction: The Nanny Killers 

Tortured to Death: Murdering the Nanny

Mark Walton on Good Morning Britain



Southfields burned garden body: Two charged with murder – BBC News

Sophie Lionnet: The ‘toxic’ couple who murdered their au pair – BBC News

Couple obsessed with Boyzone member guilty of killing French nanny – The Guardian

Haunting last image of tortured and starved nanny, 21, taken by evil couple just two days before they murdered her – The Mirror

Sophie Lionnet death: Body parts found in bonfire – BBC News

Murder accussed ‘screamed abuse at nanny – BBC News 

“I’m scared”: Full, horrifying transcripts of ‘torture tapes’ couple recorded before murdering nanny – The Mirror

Nanny killer Sabrina Kouider described by ex as ‘fickle lunatic’ – The Daily Mail

Sophie Lionnet’s alleged killer cried ‘what have I done? – BBC News

Sophie Lionnet murder accused ‘claimed Trump connection’ – BBC News

Nanny Sophie Lionnet’s killer Sabrina Kouider writes bizarre apology letter – The Sun 

Fashion designer admits she should have called police – 9News

Sophie Lionnet death: Accused ‘screamed like a mad woman – BBC News 

First pictures of garden where murdered nanny’s body was burned on bonfire – Metro News 

French nanny Sophie Lionnet’s mother demands death penalty – The Daily Mail

A London couple’s shared delusions led to the torture and death of French au pair – The Washington Post 

Murdered French nanny had a chance to escape – Sky News



Boyzone founder on ex accused of killing nanny: She’d go crazy – The Evening Standard

My daughter had issues with family, says father of ‘murdered’ au pair – The Evening Standard

Man retracts confession and blames lover for killing nanny – The Evening Standard

Nanny was like angel with the children, neighbour says – The Evening Standard

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