Eduardo Frei Montalva place of burial Santiago General Cemetery
Death
In 1981 Frei was suffering from chronic acid reflux, stemming from a hiatal hernia, an unpleasant but not life-threatening condition. He was operated on for the condition, but died in Santiago on 22 January 1982, six days after his 71st birthday. His death at the time was attributed to septicaemia stemming from surgery. He was buried in the Cementerio General de Santiago.
It was later alleged that Frei had been poisoned by DINA, the intelligence service of the military government, with a toxin produced by biochemist Eugenio Berrios. After it was reported that researchers from the University of Ghent in Belgium had discovered traces of mustard gas in Frei's body, the former president's family filed a lawsuit.Frei's personal doctor, Patricio Rojas, who was also his Minister of the Interior, denied the accusations. El Mercurio columnist Hermógenes Pérez de Arce disputed the existence of the Belgian report, citing a denial by the university's chief of communications, Tom de Smedt, that an investigation had been done at the university. Tissue samples sent to FBI labs and to the labs at the University of Ghent showed no evidence of toxic substances.  A Chilean doctor reportedly found residues of sulfonic salts, which can be the result of the decomposition of mustard gas but can also be the result of the decomposition of a corpse.In December 2009, six individuals were arrested for their roles in the alleged assassination.Judge Alejandro Madrid based his decision on a report that determined that low doses of thallium and mustard gas were administered to Frei over an extended period while he was hospitalized at the Santa María Clinic in Santiago, and that these toxic substances had the effect of decreasing Frei's immune system, making him too weak to survive his surgery.The report was widely criticized by the surgical team in El Mercurio and La Segunda, newspapers owned by the Edwards family, who had brokered the coup and maintains strong ties to the CIA and to Pinochet's government. The Appeals Court suspended Judge Madrid from the case, and the accused were freed on bail.The case was re-opened in 2010 after a failed attempt to disqualify Judge Madrid.On 30 January 2019, the six suspects were found guilty of homicide and given sentences ranging from 3 to 10 years in prison.
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