Her victims included a husband, a son, and a boyfriend — a pattern of harm that unfolded across more than a decade before investigators began connecting the deaths. Arsenic poisoning, collected insurance payouts, and a car bombing tied together a case that made her the first woman executed in Florida in over a century.

Fourniret operated for over fifteen years before his arrest, preying primarily on young women and girls across France and Belgium with the active knowledge of his wife. The partnership between the two — and Olivier's eventual decision to inform on him — made the case unusual among serial killer investigations of its era. His confessions came in stages over years, with victims' families waiting long after his 2003 arrest to learn the fates of those he had killed.