Tennis coach Mark de Jong, who was training Dutch pro Robin Haase (pictured here), was arrested over the weekend and charged with the murder of Koen Everink. (Image: Getty\/smh.com.au)<\/figcaption><\/figure>\nAccording to police, de Jong came forward the day following the discovery of Everink\u2019s body, at his home in Bilthoven, near Utrecht in the Netherlands. The 29-year-old coach told authorities that the two men had watched a soccer game together, and that he had seen \u201csuspicious characters\u201d hanging around the house as he left.<\/p>\n
Investigators were skeptical of de Jong\u2019s account, but nevertheless permitted him to travel with Haase to the US for the APT Masters in Miami. He was later arrested upon his return to the Netherlands at Schiphol Airport.<\/p>\n
High Stakes, High Gambling Debts<\/b><\/h2>\n
De Jong is a former journeyman player on the Challenger circuit (the international minor leagues), who later switched to coaching; he had worked with Haase since 2014. But according to Dutch media sources, he is also a problem gambler and poker player, who often played for high stakes.<\/p>\n
The Dutch language version of PokerNews found that he was indeed known within the country\u2019s poker community, where word is he is known as a notoriously bad poker player.<\/p>\n
These sources, not independently verified, claim that the two men had been quarreling over an \u20ac80,000 ($89,548) loan that Everink had given him in order to cover his gambling losses. The now-deceased man had allegedly agreed to the loan, but wanted the money back as quickly as possible, reportedly threatening to expose de Jong\u2019s out-of-control gambling habits in the media unless he complied.<\/p>\n
De Jong is described by poker acquaintances as \u201ca very bad player\u201d who never worked on his game and approached poker as a \u201cpure gamble.\u201d According to the sources, he failed to show up to a single appearance at the recent Australian Open, because he was waylaid at the Aussie Millions at the Crown Casino where he was badly stuck in cash games.<\/strong><\/p>\n