( CNN ) -- International investigators say there 's no evidence that poet Pablo Neruda was poisoned . Scientists who exhumed Neruda 's remains in April revealed details of their investigation last week , confirming that the Nobel prize-winning poet suffered from prostate cancer when he died four decades ago . But the results have n't stopped skepticism from one member of Neruda 's family , who told CNN Chile that he 's still pushing for answers about what caused the poet 's 1973 death . `` This is a first report that ... opens the door for us to request new tests , '' nephew Rodolfo Reyes said in an interview with CNN 's sister network . Neruda 's death certificate says prostate cancer killed him . But for years his former chauffeur has offered up another theory , claiming that Neruda was poisoned in the clinic where he was undergoing treatment . Last week 's report from a team of scientists said investigators found `` no forensic evidence '' to support that Neruda had been killed by anything other than natural causes . `` No relevant chemical agents that could be linked to Mr. Pablo Neruda 's death have been found , '' the report said . Neruda died on September 23 , 1973 , just 12 days after a right-wing military coup ousted socialist President Salvador Allende and brought Gen. Augusto Pinochet to power . The poet , a Communist Party member , had criticized the coup and Pinochet . Less than two weeks later , he was dead . He had been planning to go into exile the next day -- and the timing of his death was no coincidence , chauffeur Manuel Araya has said . `` I believe that Pablo Neruda was murdered , because Pablo Neruda was a very relevant figure in history , as much in this country as in the world , '' Araya told CNN Chile earlier this year . `` He was going to go into exile on September 24 and they silenced him before then . '' Neruda was a well-known political and public figure , having served as a lawmaker and diplomat in addition to his literary career , which earned him a Nobel Prize in 1971 . Thousands of people disappeared or died during Pinochet 's rule , and many have accused his government of using death squads to wipe out political opponents . Attorney Eduardo Contreras , who represents Chile 's Communist Party , told reporters that more tests on Neruda 's remains are necessary . `` The Pablo Neruda case is not closed , '' Contreras said . Report : Tests 'moderately support ' that Yasser Arafat poisoned by polonium .
Scientists say Pablo Neruda suffered from prostate cancer when he died . Tests find no proof to support claims that the poet was poisoned . Neruda 's nephew says he plans to push for more tests . Score: 6