Serial killer abused and tortured children in 'manmade dungeon'WARNING, GRAPHIC CONTENT: The serial killer was dubbed 'Le Monstre' due to the horrific nature of his crimes. Assisted by multiple accomplices including his wife, the infamous serial killer also allegedly trafficked numerous children into slavery in overseas nations. Dutroux allegedly held the children captive in his chamber of horror, repeatedly sexually abusing them and creating child pornography footage of the abuse. In May 1996, Dutroux abducted 12-year-old Sabine Dardenne, who was repeatedly assaulted and violated by the serial killer. In 2019, Michel Lelièvre was freed from prison after serving 23 years of his 25-year prison sentence.