Sabrina Kouider, 35, and Ouissem Medouni, 40, killed Sophie Lionnet over a bizarre obsession with an ex-Boyzone popstar.
The shy 21-year-old au pair was starved and tortured by the pair in the weeks leading up to her death in September last year.
She was beaten, killed and thrown on a bonfire by her employers after being accused of being “in league” with Kouider’s ex-partner Mark Walton, a founding member of the Irish boy band.
Mother-of-two Kouider and Medouni interrogated their nanny for hours to extract some sort of “confession” to confirm their “perverted suspicions”.
Snippets of more than eight hours of mobile phone recordings of the defendants’ interrogations were played to the jury.
More from UK
Some cheer for retail amid crisis facing the high street as sales surge
LIVE: More powerful tributes from Grenfell victims’ families
Why Jeremy Corbyn is courting controversy with Northern Ireland visit
Businesses urged to give ex-offenders a ‘leg up’ by employing them
‘We’ll have to pay a lot more’: Households could face £2,000 bill for sustainable NHS
Teenager arrested in Hertfordshire on suspicion of preparing terror acts
Miss Lionnet suffered a fractured jawbone hours before her death and she is also known to have suffered bruising, and fractures to her sternum and ribs between 36 hours and three days before dying.