Joran van der Sloot was sentenced to 20 years in a U.S. federal prison, starting after he completes his time in Peru for Flores' murder.
Beth Holloway declared that Natalee's case is now solved, and van der Sloot is no longer a suspect but a confirmed killer.
Holloway spoke in court, describing how van der Sloot bludgeoned Natalee after she rejected his advances and disposed of her body in the ocean, telling him, "You are a killer.