Willem Holleeder was already a public figure in the Netherlands before the courts examined the killings for which he is now serving a life sentence. In 1983 he and his partner Cor van Hout took part in the kidnapping of Alfred "Freddy" Heineken and his driver in Amsterdam, a case that made both men known across the country. Twenty years later Van Hout was dead, and over the next three years four more men died, another man was seriously injured, and a further attempt was made on the life of a man who survived it. The Amsterdam courts attributed these offenses to Holleeder's orders. He was not found to have carried out any of them himself. The finding, repeated at three levels of the Dutch judiciary, is that he incited them.
The Amsterdam District Court convicted him on July 4, 2019, of inciting ("uitlokken") six offenses between 2002 and 2006, which together involved five murders, one manslaughter and one attempted murder, with serious bodily injury to one man, and of participating in a criminal organization. The Amsterdam Court of Appeal confirmed the verdict and the sentence of life imprisonment on June 24, 2022. The Supreme Court of the Netherlands (Hoge Raad) rejected his appeal in cassation on January 9, 2024, which made the conviction final. Holleeder denied the charges throughout. No intercepted calls or technical findings tied him to the killings; the courts relied on the accounts of witnesses, among them relatives who testified against him, and on his own recorded remarks.
In 1983 Holleeder and Van Hout kidnapped Alfred Heineken and his driver in Amsterdam. A ransom of 35 million guilders was paid. The two kidnappers fled to France, where they were arrested, and they were returned to the Netherlands after a new treaty made extradition possible. In 1987 a Dutch court sentenced both men to eleven years. They were released in 1992 and held a party in an Amsterdam hotel.
The two men stayed bound together by the fame of the kidnapping, although they fell out during the 1990s. At the murder trial the prosecution argued that money, including inheritances and what remained of the ransom, lay behind the conflicts that ended in the killings. The court's own findings on motive were narrower and apply to the offenses as a whole: that the decisions over life and death were taken coldly and without scruple, for money or to prevent someone from retaliating or from speaking to the police.
The next case against Holleeder, in 2007, had nothing to do with killing. On December 21, 2007, the Amsterdam court found him guilty of extorting three men, of leading a criminal organization, of money laundering and of assault, and sentenced him to nine years; the prosecution had asked for twelve. Five co-defendants received sentences ranging from 240 hours of community service to 33 months, and three were acquitted. Willem Endstra and Kees Houtman were two of the men he was found to have extorted, and both had been killed before the verdict. Endstra's own recorded statements to the police, made before his death, were the most damaging evidence in that case. The Amsterdam appeal court upheld the nine-year sentence on July 3, 2009.
Suspicions that Holleeder had been involved in killings arose during that case, but the evidence was judged insufficient to prosecute him for them at the time. He was released in January 2012 and became a public personality: he wrote a magazine column, recorded a song with a rapper and appeared on a television program. When his murder trial opened, the prosecution said that it meant to strip away that image and show him as an extortionist and a killer.
In September 2014 the Public Prosecution Service opened a new preliminary investigation after statements by a new crown witness, Fred Ros. Crown witnesses in the Netherlands are men facing their own prosecutions who agree with the Public Prosecution Service to testify in return for a reduced sentence. Ros's statements indicated that Holleeder was suspected of having ordered three killings, and a second crown witness, Peter la Serpe, had already made statements that incriminated him.
Holleeder was arrested on Saturday, December 13, 2014, at the age of 56. The prosecution said it suspected him of complicity in the murders of Kees Houtman in 2005 and Thomas van der Bijl in 2006 and of participating in a criminal organization, and it cited new evidence. A court ordered him held in custody for two weeks while the inquiry continued.
On March 5, 2015, the Haarlem court found Holleeder guilty of threatening a Dutch television crime reporter. It sentenced him to 46 days for the threats and to a further 90 days for breaking the terms of his early release.
In March 2015 the statements that two of Holleeder's relatives and a former partner had given to the police about his alleged involvement became public. The Public Prosecution Service had held them for about two years. At the pro forma hearing on June 18, 2015, the prosecution announced that the case would be extended to include inciting the murder of Cor van Hout in 2003 in Amstelveen, inciting the murder of Willem Endstra in 2004 in Amsterdam, inciting the murder of John Mieremet in 2005 in Thailand and inciting an earlier attempt on Mieremet in Amsterdam in 2002. The added charges rested on sworn statements by four people, which the prosecution said fitted the evidence it already held. The court extended his pre-trial detention by three months. On December 4, 2015, the prosecution announced that it had added the two Mieremet cases to the file and asked that he stay in custody for them.
Over the next two years the court held a series of pro forma hearings, ruled on requests from both sides and decided what the public and the press could see. On December 23, 2017, Holleeder was the first person questioned in the main hearing, which opened formally on February 5, 2018.
Cor van Hout died in Amstelveen on January 24, 2003. He had been Holleeder's partner in the 1983 kidnapping. Robert ter Haak, who was with him, was fatally injured in the same offense and died on February 11, 2003.
The court found that Holleeder had incited the murder of Van Hout together with others, and the manslaughter of Ter Haak in the same offense. Among the remarks of Holleeder's own that the court cited was "Finally it succeeded", said after Van Hout's death. Relatives who testified told the court that they saw Holleeder as the organizer of the killing of Van Hout, and the court found their evidence reliable.
Willem Endstra died in Amsterdam on May 17, 2004. A second man was seriously injured in the same offense and survived. Endstra was one of the three men Holleeder was convicted in 2007 of extorting, and the statements he gave the police before his death were admitted as evidence in that case. In 2019 the court found that Holleeder had incited his murder together with another person, and had incited the offense of serious bodily injury against the injured man.
The first-instance court named the late Endstra among the witnesses whose statements it considered reliable. Holleeder's lawyers argued that nothing tied Holleeder to the offense.
John Mieremet figures in two of the offenses. On February 26, 2002, there was an attempt on his life in Amsterdam, which he survived; the court found that Holleeder had incited it together with another person. On November 2, 2005, Mieremet died in Pattaya, Thailand, and the court found that Holleeder had incited that murder together with another person or others.
At the trial in 2018 Holleeder said that accounts of his paying for killings had originated with Mieremet. The court did not accept this.
Kees Houtman died in Amsterdam-Osdorp on November 2, 2005, his 46th birthday and the same day as Mieremet. He was one of the three men Holleeder had been convicted in 2007 of extorting, and the court found that Holleeder had incited his murder together with another person.
Holleeder told the trial court in October 2018 that he did not know why Houtman had been killed and had nothing to do with it. He said he had met Houtman in Spain in 1992 and described him as a friendly acquaintance.
Thomas van der Bijl died in Amsterdam on April 20, 2006. He was a close friend of Cor van Hout. The court found that Holleeder had incited his murder together with another person.
The killings of Houtman and Van der Bijl were also the subject of a separate trial of other men, in which the Amsterdam appeal court ruled on June 29, 2017. Nine of the twelve original suspects were convicted, two had died and one was acquitted. Dino Soerel was sentenced to life imprisonment, as were three other men. Crown witness Peter la Serpe received eight years and crown witness Fred Ros fourteen. Holleeder was not a defendant in that case. In his own case the appeal court found that he took part in the criminal organization alongside Soerel, La Serpe, Ros and others.
The trial opened on February 5, 2018, in a high-security courtroom in Amsterdam-Osdorp. Seating was limited, and a second courtroom received a live video link to meet public demand. In all, 62 witnesses testified before the verdict.
The prosecution's case rested mainly on witness statements, not on technical evidence. The witnesses included two of Holleeder's relatives, who had secretly recorded conversations with him over several years and given the recordings to the Public Prosecution Service, a former partner, two crown witnesses, one anonymous threatened witness and a witness who died in an accident at the end of 2017, whose earlier statements were put to the court. Holleeder's lawyers argued that none of it amounted to direct proof: there were no telephone intercepts and no technical evidence tying him to any of the offenses. They said that the dead men moved in a world where many people could have been responsible, and that the relatives who testified were acting from financial motives, including claims on an inheritance.
On March 1, 2019, the prosecutors asked for life imprisonment. They told the court that the evidence was legal and convincing and that Holleeder had decided on life and death from a distance.
The Amsterdam District Court gave its verdict on July 4, 2019. Because of the public interest, spectators followed the reading of the judgment by video link from another courtroom; it took a little over an hour. The court found that Holleeder, with others, had formed a criminal organization that had the offenses carried out, and that he had incited six offenses between 2002 and 2006: five murders, one manslaughter and one attempted murder, with serious bodily injury to one victim. It described them as premeditated, paid liquidations carried out in an organized way for large sums of money.
The court held the testimony of the relatives, the former partner, the two crown witnesses, the anonymous witness and the late Endstra to be reliable. It found no sign that the relatives who testified had coordinated their accounts and no reason to doubt the recordings they had made. It described Holleeder's own statements as untruthful and opportunistic and noted that he had given inconsistent accounts and at times invoked his right to remain silent. The chief judge, Frank Wieland, told him: "You were merciless and indifferent in your belief that you had the power of life and death." The court concluded that there was a serious risk of further violent offenses and imposed life imprisonment, as the prosecution had asked.
Relatives of the victims applauded in the courtroom. The lawyer for the relatives who had testified said that the sentence spoke for itself. Holleeder's lawyer read a statement in which Holleeder said that he was not guilty of ordering killings, that there was no evidence for it, and that the trial had been unfair. He appealed.
Holleeder appealed at once, and the case stayed with the Amsterdam Court of Appeal after a ruling on December 2, 2019. The court held a series of procedural hearings, ruled on the defense's requests for further investigation on July 8, 2020, and opened the main hearing on September 22, 2020, in a secure courtroom, with very few seats for the public because of the pandemic. On October 15, 2020, it banned the recording and publication of sketches of witnesses. The hearings of October 21 and 22, 2020, were held behind closed doors, and on December 11, 2020, the court agreed to hear an anonymous threatened witness.
The hearing lasted more than 40 sitting days and heard 27 witnesses. The case file had grown to about 1,000 binders and half a million pages. The advocates-general, who act as prosecutors on appeal, took two days for their closing argument and on November 25, 2021, asked for life imprisonment again, as the prosecution had at first instance. They described the evidence as resting mainly on witness statements, not on technical evidence. The defense pleaded for acquittal in December 2021. Holleeder gave his final statement on January 21, 2022, and the court closed the hearing on June 10, 2022.
The Court of Appeal gave its ruling on June 24, 2022. The judgment runs to roughly 500 pages, and a 13-page summary was read aloud. It found proven that Holleeder had incited, in each case together with another person or with others:
the attempted murder of John Mieremet on February 26, 2002, in Amsterdam; the murder of Cor van Hout on January 24, 2003, in Amstelveen; the manslaughter of Robert ter Haak in the same offense, who died on February 11, 2003; the murder of Willem Endstra on May 17, 2004, in Amsterdam and an offense of serious bodily injury against a second man in the same incident; the murder of John Mieremet on November 2, 2005, in Pattaya, Thailand; the murder of Kees Houtman on November 2, 2005, in Amsterdam-Osdorp; and the murder of Thomas van der Bijl on April 20, 2006, in Amsterdam.
It also found proven that he had participated, from January 1, 2002, to May 1, 2006, in a criminal organization whose purpose was carrying out killings, alongside Soerel, La Serpe, Ros and others.
The court said that the evidence, which included witness statements and secret recordings in which Holleeder partly admitted the facts, proved his guilt, although he had denied any involvement. It held that no sentence lower than life imprisonment was possible because of the cold and unscrupulous way in which he and others in the criminal organization decided over life and death, out of financial motives or to stop retaliation or cooperation with the police, and that retribution and deterrence required it. The judges stressed that the case was not the word of Holleeder against the word of his relatives: every witness account was supported by other documents in the file. They found that the relatives' hesitant approach to the police in 2013 did not point to a financial interest, and that the defense's alternative scenarios about who had ordered the killings had no support in the evidence. The court also awarded the injured parties higher damages than the District Court had.
Holleeder answered "No" when the presiding judge said he would not agree with the ruling, and he announced that he would go to the Supreme Court. The lawyer for the relatives who had testified said that they had mixed feelings but regarded the conviction as important. Interest in the appeal was much lower than at the first trial, and some sessions had no public in the gallery.
An appeal to the Supreme Court does not reopen the facts. The Supreme Court checks only whether the lower court applied the law correctly. Holleeder's lawyers challenged the lawfulness of the agreements with the crown witnesses, the reliability of several witnesses and the life sentence. On November 14, 2023, the Advocate General advised the court to reject the appeal. In the Advocate General's view the legality of crown witness agreements had already been settled in that separate trial, and the Court of Appeal's examination of the witnesses, including the relatives and the question of whether anyone other than Holleeder was behind the killings, had given no indication that someone else was responsible.
On January 9, 2024, the Supreme Court followed that advice. It rejected the challenges to the crown witness agreements, finding them lawful and not in breach of the right to a fair trial, and found that the Court of Appeal had used the crown witnesses' statements only where other evidence supported them. The remaining grounds failed without detailed reasoning. The court found that the proceedings had taken too long, but because a life sentence cannot be shortened in the way a fixed term can, this made no difference to the sentence. The decision is final and no further appeal is possible.
Holleeder was 68 in July 2026. He has been in custody since his arrest in December 2014, and his lawyer has said that more than 11 years of that time were spent under a high-security regime. Under the general rules for life sentences in the Netherlands, a prisoner may be allowed with ministerial approval to prepare for reintegration after 25 years and may apply for a pardon after 28 years.
In February 2026 the state secretary responsible for prisons extended his stay in the high-security regime by another year, despite advice in favor of a transfer. Holleeder appealed. In July 2026 the Council for the Application of Criminal Law and Juvenile Protection (RSJ) ruled that the decision was unreasonable and unfair, found that less intrusive measures could limit the danger and ordered a new decision. The prosecution had wanted him held in high security for the whole of his sentence. By July 24, 2026, he had been moved to a less strictly secured regime in the Netherlands, in an intensive supervision unit. His lawyer called it a more humane regime. A ministry spokesperson said that such placements are reassessed periodically and that prisoners can be moved to a stricter regime if necessary. The life sentence is unchanged.
A Dutch criminal case of this size passes through three levels. The district court (rechtbank) hears the facts first, the court of appeal (gerechtshof) hears them again in full, and the Supreme Court (Hoge Raad) decides only on questions of law. A defendant can be convicted as an inciter: the Dutch word "uitlokking" is rendered as incitement or instigation, and in Holleeder's case it means that the courts found that he caused others to commit the offenses, in each case "together with" others, not that he committed them himself. The offenses themselves are named in Dutch law as murder ("moord"), manslaughter ("doodslag") and attempted murder.
Crown witnesses are an established feature of the system and were central to this case. In that separate trial the Amsterdam appeal court recorded that agreements with them allowed the prosecution of their own offenses to be reduced by up to half, and that two of them, Ros and La Serpe, had been found reliable. In April 2019 the Supreme Court ruled that such agreements were legally permissible, that prosecutors could settle with crown witnesses without prior court review and that it saw no reason to doubt the two men's reliability. It also rejected the argument that life sentences breach the ban on inhuman treatment in the European Convention on Human Rights. When Holleeder's own case reached the Supreme Court in 2024, his lawyers raised the same objections to the crown witness agreements and they failed again.
Holleeder's defense rested on three claims. The first was that there was no direct evidence of any order given by him: no intercepted calls and no technical findings, only the word of witnesses. The courts accepted that the proof was mainly statements and held that the witness accounts were supported by other material in the file.
The second was that the relatives who testified had financial motives, because an inheritance was at stake. The District Court rejected that, and the appeal court found that the relatives' reluctance to go to the police in 2013 did not show such an interest and that they had not used many opportunities to accuse him.
The third was that the killings were the work of other people. The defense put forward alternative scenarios about who had ordered them, including a man who was himself killed in 2011. The appeal court found no evidence to support them and pointed instead to Holleeder. The Supreme Court did not review that finding of fact.
1983: Holleeder and Cor van Hout take part in the kidnapping of Alfred Heineken and his driver in Amsterdam; a ransom of 35 million guilders is paid.
1987: Holleeder and Van Hout are each sentenced to eleven years.
1992: Both are released.
February 26, 2002: Attempt on the life of John Mieremet in Amsterdam; he survives.
January 24, 2003: Cor van Hout dies in Amstelveen; Robert ter Haak is fatally injured in the same offense and dies on February 11, 2003.
May 17, 2004: Willem Endstra dies in Amsterdam; a second man is seriously injured.
November 2, 2005: Kees Houtman dies in Amsterdam-Osdorp and John Mieremet dies in Pattaya, Thailand.
April 20, 2006: Thomas van der Bijl dies in Amsterdam.
December 21, 2007: Holleeder is sentenced to nine years for extortion, leading a criminal organization, money laundering and assault.
July 3, 2009: The Amsterdam appeal court upholds the nine-year sentence.
January 2012: Holleeder is released.
September 10, 2014: The Public Prosecution Service opens a new investigation after statements by crown witness Fred Ros.
December 13, 2014: Holleeder is arrested.
March 5, 2015: The Haarlem court convicts him of threatening a television crime reporter.
June 18, 2015: The prosecution extends the case to the murders of Van Hout, Endstra and Mieremet and the earlier attempt on Mieremet.
December 4, 2015: The Mieremet cases are added to the file.
June 29, 2017: In a separate trial of other men the Amsterdam appeal court sentences Dino Soerel and three other men to life imprisonment.
February 5, 2018: The main hearing opens in Amsterdam.
March 1, 2019: The prosecution asks for life imprisonment.
April 2019: The Supreme Court approves the crown witness agreements used in that separate trial.
July 4, 2019: The Amsterdam District Court sentences Holleeder to life imprisonment.
September 22, 2020: The appeal hearing begins.
November 25, 2021: The advocates-general ask for life imprisonment.
June 24, 2022: The Amsterdam Court of Appeal confirms the life sentence.
November 14, 2023: The Advocate General advises the Supreme Court to reject the appeal.
January 9, 2024: The Supreme Court rejects the appeal; the conviction and sentence become final.
February 2026: His stay in the high-security regime is extended by a year.
July 2026: The RSJ rules the extension unreasonable and unfair; he is moved to a less strictly secured regime.