While saying what the poet and Communist Party politician did not die of, the experts did not say what he did die of or address suspicions that he was murdered by agents of Gen. Augusto Pinochet's dictatorship after the country's 1973 military takeover.
Panel members said they will continue to identify pathogenic bacteria that might have caused Neruda's death to determine if a third party was involved.
"The fundamental conclusions are the invalidity of the death certificate when it comes to cachexia as a cause of death," said Aurelio Luna, one of the panel's experts.
"We still can't exclude nor affirm the natural or violent cause of Pablo Neruda's death."
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Neruda's body was exhumed in 2013 to determine the cause of his death but those tests showed no toxic agents or poisons in his bone. His family and driver demanded further investigation.
Neruda was best known for his love poems. But he was also a friend of socialist President Salvador Allende, who killed himself rather than surrender to troops during the September 11, 1973, right-wing coup led by Pinochet.
Neruda was traumatised by the military takeover and the persecution and killing of his friends. He planned to go into exile, where he would have been an influential voice against the dictatorship.
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