.
Fourniret strangled Laville with rope before Olivier drugged her with Rohypnol to sedate her.
They took Laville to their house in Saint-Cyr-les-Colons where Fourniret raped and strangled Laville to death.
Her remains were found at the bottom of a disused well in 2006.
The van Fourniret used to abduct his last victim - the couple often lured targets into vehicles before taking them to secluded areas Credit: AFP - Getty Their second killing was slightly different from the others.
Farida Hammiche, 30, was the wife of a bank robber Fourniret had shared a prison cell with – she contacted him asking for his help digging up a stash of gold bars buried in a graveyard in March 1988.
He agreed to help and Hammiche paid him for the job, but a month later Fourniret strangled her to death and took the haul for himself.
Fourniret and Olivier bought a stunning castle called the Château du Sautou in northern France with their newfound fortune.
Hammiche's body was never found.
Explosion of bloodlust Their killing then became insatiable over the next few years.
While heavily pregnant with Fourniret's baby, Olivier lured 20-year-old Fabienne Leroy from a supermarket into her car feigning illness and pretending to need directions to a doctor's surgery.
Château du Sautou, which Fourniret and Olivier bought with Hammiche's stolen money Credit: Getty Images - Getty They drove her to a forest, where Leroy was tied up, raped, and shot dead with a shotgun.
Olivier said she'd checked Leroy was a virgin before the killing on Fourniret's orders, but later said she didn't go through with it.
Jeanne-Marie Desramault, 21, met the killer couple on a train in 1989 as she was travelling to stay in a convent – Fourniret reportedly found her like a vision of the Virgin Mary.
Desramault was invited to their house to babysit but, when Fourniret asked her if she was a virgin after she arrived, he flew into a rage when she said no.
Jeanne-Marie Desramault - she allegedly reminded Fourniret of the Virgin Mary Credit: Getty - Contributor The couple gagged and strangled her to death before burying her in the grounds of the Château du Sautou.
Police would also find the body of 12-year-old Elisabeth Brichet near Desramault in the soil years later.
Fourniret and Olivier abducted Brichet as she was walking home from a friend's house in Belgium.
After attempting to suffocate her with a plastic bag, Fourniret strangled her to death, storing her body in a freezer before burying her in the castle grounds.
Elisabeth Brichet was just 12 years old when she was murdered by Fourniret and Olivier Credit: AP:Associated Press A year later, they lured 13-year-old Natacha Danais into their van after they spotting her walking home from a shop to fetch her mum's forgotten purse.
They stabbed her in the chest with a screwdriver, strangled her, and dumped her body on a beach.
At trial, it was suggested that Fourniret raped her after she was dead.
Danais was the last murder they carried out together.
Brichet and Desramault's bodies were found near each other in 2004 Credit: AFP - Getty In 2000, Fourniret raped and murdered 18-year-old Céline Saison before abducting, raping and murdering 13-year-old Mananya Thumpong a year later.
Saison's body was found by mushroom foragers a few months after her death, while Thumpong's body was mostly eaten by wild animals by the time was discovered in the woods almost a year later.
Brought to justice Fourniret's stomach-turning reign of terror came to a dramatic end in 2003 when his tried and tested method of kidnapping finally went wrong.
He lured a 13-year-old Belgian girl into his van and tied her up, sexually assaulted her, and threatened to kill her.
Fourniret leaving a Belgian court after his arrest in 2003 Credit: AFP - Getty But when the van stopped the girl broke free of her restraints and got out the vehicle – a passing motorist picked her up and managed to jot down Fourniret's licence plate.
He was soon in custody and the victim's hair found in his van.
Olivier turned on her husband in a bid to avoid a lengthy sentence herself and claimed she'd been the victim of a controlling psychopath.
Realising he was doomed, Fourniret cooperated with police and confessed to many of the crimes, even showing investigators where some of his victims were buried.
Fourniret led police to some of the sites where he'd dumped victims Credit: EPA In 2006, one of his daughters from a previous marriage tragically took her own life after her father's horrific acts became known.
At trial in 2008, Fourniret was convicted of seven murders and sentenced to life in prison.
Olivier was also given a minimum of 28 years for her complicity in the killings.
Evidence at Fourniret's trial including rope and weapons Credit: Getty Images - Getty The sickening testimony at trial included Fourniret saying he'd made Saison and Thumpong say: "Would you make love with me, monsieur?" and "Thank you, monsieur," during their ordeal – phrases which Olivier admitted using herself to excite him during sex.
Fourniret and Olivier divorced while in prison in 2010.
Dad can 'only feel terror' But that wasn't the end of the story – with Fourniret making more explosive confessions in recent years.
In 2018, he admitted responsibility for the 1990 murder of Joanna Parrish , a Leeds University student from Gloucestershire who was raped and murdered while working at a school in Burgundy as part of her French degree.
Joanna Parrish's murder went unsolved for 28 years Credit: PA:Press Association And he also confessed to killing Marie-Angèle Domèce, an 18-year-old disabled woman, two years earlier.
And in 2020, one of France's most high-profile missing persons cases focused on the Ogre of the Ardennes.
Nine-year-old Estelle Mouzin didn't come home from school in Guermantes in France in 2003, and a national search for her was launched.
And when Fourniret was arrested in Belgium later in the year, he was suspected to be involved – but a phone call from his home at the time of Mouzin's disappearance gave him an alibi.
Estelle Mouzin vanished in 2003 shortly before Fourniret's arrest Credit: AFP - Getty The case went unsolved for nearly 17 years until Olivier admitted in 2020 she'd made the phone call that discounted Fourniret from the investigation.
And Fourniret also personally confessed to being involved with Mouzin's disappearance.
Last month, cops used diggers to search for Mouzin's body in the forests of Ardennes after Olivier gave authorities new information about the whereabouts of her remains.
And earlier this year Mouzin's father, Eric, slammed a TV film about his daughter's killers, reports.
"These criminals of the worst sort are becoming fictional characters,” Mouzin said.
He added he could “only feel the terror of Estelle when she found herself in Fourniret’s van”.
Archive footage shows the trial of serial killer Michel Fourniret, the Ogre of Ardennes