sister, Astrid, who made secret recordings of their conversations. Victim Van Hout was married to Holleeder's sister Sonja, and she too gave evidence against him. The cases in which Holleeder was found guilty Sam Klepper, criminal - shot dead, 2000 Cor van Hout, friend, brother-in-law and ex-accomplice - shot dead, 2003 Willem Endstra, property developer - shot dead, 2004 Kees Houtman, drug dealer - shot dead, 2006 Thomas van der Bijl, bar owner and family friend - shot dead, 2006 He was also found guilty of ordering the 2002 attempted murder of John Mieremet, Klepper's business partner (later shot dead in Thailand in 2005) and of the manslaughter of Robert ter Haak, who died of bullet wounds during the fatal attack that Holleeder had ordered on Cor van Hout. Holleeder appealed the verdict. In June 2022, Holleeder was again sentenced to life imprisonment on appeal. He announced his intention to file another appeal with the Supreme Court of the Netherlands, the highest court in the country. Bibliography References Dutch kidnappers 1958 births 20th-century Dutch criminals 21st-century Dutch criminals Living people Criminals from Amsterdam Dutch prisoners and detainees Prisoners and detainees of the Netherlands Dutch gangsters