An anti-vaxxer kickboxing champion has died after he refused to accept Covid is dangerous and tried to treat himself at home. Frederic Sinistra, 41, discharged himself from a hospital in Liege, Belgium, after denying he had been infected with Covid which he described as a "little virus". But the three-time world champion died with complications relating to the virus in the small Belgian city of Ciney just weeks later. Reports claim the 41-year-old, known as the 'Undertaker', told his followers on social media he would treat his symptoms away from the hospital. Posts shared to Sinistra's Facebook page showed the kickboxing champion, who had a 39 win to nine loss record, lying in bed at an intensive care ward with an oxygen tube in his nose. However, Sinistra also posted a video to his 37,000 Facebook followers in which he seemed to have some difficulty breathing. He added the caption "no time to waste with lazy people". In other posts he called Covid the "little virus" and voiced opposition to the Government's measures to halt the spread of coronavirus. Local reports suggest the kickboxer only entered hospital after being forced to do so by his coach Osman Yigin. Sinistra's partner then announced his passing on December 16. Sinistra also previously called Covid "la grippe des cheveux", meaning the hair flu and criticised measures such as mask mandates and vaccine passes.