Ronald Pieper (1978) is a Dutchman convicted for the murder of air hostess Christel Ambrosius in Putten in 1994. After allegedly fleeing the scene, two other suspects were arrested by the police. Although innocent, the latter two served a prison sentence of 10 years. After their release Ronald Pieper, was arrested in 2008, based on DNA testing which linked him to the victim. He was sentenced to an 18-year sentence. During his imprisonment he allegedly confessed the murder on student Anneke van der Stap in 2005 in Rijswijk to a fellow convict.