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Sabrina Kouider is a British woman currently serving a prison term of 30 years to life for the 2017 torture slaying of her French-born nanny, Sophie Lionnet. She was profiled in Season 13, Episode Six of Deadly Women, "Kill the Competition."

Sabrina lived in Wimbledon, London. In 2011, she met and began a romantic relationship with Mark Walton, a founding member of the popular Irish boy band Boyzone who had since become an internationally successful pop music mogul. Mark introduced Sabrina to the glitz and glamour of life in the fast lane. However, Mark couldn't deal with Sabrina's extreme jealousy. She constantly accused him of sleeping with male prostitutes and even hid cameras in his own house so she could spy on him. Mark finally had enough, and ended the relationship. Sabrina fled back to the arms of Ouisseem "Sam" Medouni, her longtime stand by who had always been there to comfort Sabrina when one of her relationships ended.

In 2016, Sabrina and Sam were living together as a couple and raising Sabrina's two children from previous relationships. The couple hired Sophie Lionnet, a 20-year-old from France who was eager to make it on her own and improve her English, as an au pair for their children. While Sophie looked after the kids, Sabrina continued to stalk and harass Mark Walton, accusing him of various outlandish transgressions, including sexually abusing her cat. Eventually, Sabrina came to believe that Sophie was a spy sent by Mark Wilton to destroy her and her family. This belief had no basis in reality, but Sabrina managed to convince Sam it was true.

Sabrina and Sam's abuse of Sophie began with denying her food and treating her like a slave, then escalated to physical abuse, slaps and beatings with electrical cords and other instruments. Sabrina told Sophie she could only leave if she confessed that she was working for Mark Walton and drugging Sam. Sophie's denials resulted in hours of interrogation and torture, all captured by Sabrina and Sam on their smartphones. Finally, Sophie offered a false "confession", in the hope that Sabrina would make good on her promise and release her. Instead of letting Sophie leave, Sabrina and Sam escalated the torture by trying to drown her in the bathtub in between beatings. On September 19, 2017, Sophie Lionnet died.

Sam burned Sophie's body in the yard and attempted to hide the smell of burning flesh by barbecuing chicken. When firefighters responded to calls from neighbors, Sam told them Sophie's remains were those of a sheep; they were not fooled. Sabrina and Sam attempted to blame each other and insisted Sophie's death was manslaughter, not murder, but the recordings they made of their torture sessions contradicted their stories. Both Sabrina Kouider and Sam Medouni were convicted of murder and perverting the course of justice and are serving 30 years to life. Sam Medouni is appealing his sentence.

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