Late Palestinian leader Yasser Arafat did not die a natural death, the head of a Palestinian fact-finding commission said on Friday. 'He did not die of old age and not of an illness,' commission head Tawfik Tirawi said in the city of Ramallah. Swiss scientists said on Thursday that tests support a supposition that Arafat died from polonium poisoning. The forensic and radiological experts at Lausanne University Hospital Centre said the result of their work 'moderately' supported the allegations that Arafat had died from the radioactive metal, dpa reported.