Michel Fourniret and Monique Olivier '' Monsters of Sedan, France ''

Michel Paul Fourniret (4 April 1942 – 10 May 2021) was a French serial killer who confessed to killing 12 people in France and Belgium between 1987 and 2003. After he was arrested in June 2003 for the attempted kidnapping of a teenage girl in Ciney, Fourniret confessed to killing nine people — eight females and one male — in 2004, having been informed on by his then-wife, Monique Pierrette Olivier (born 31 October 1948). Fourniret was convicted of seven of these murders on 28 May 2008 and sentenced to life imprisonment without possibility of parole, while Olivier was given life with a minimum term of 28 years for complicity.