Lead Masks Case

The Lead Masks Case was the name given to the events which led to the death of two Brazilian electronic technicians: Manoel Pereira da Cruz and Miguel José Viana. Their bodies were discovered on August 20, 1966.
Sequence of facts
Discovery
On the afternoon of 20 August 1966 a young man aged 18 called Jorge da Costa Alves was flying a kite on the Morro do Vintém (Vintém Hill) in Niterói, Rio de Janeiro, Brazil. He found two male bodies and warned the authorities. The police waited for the next day to collect the bodies and investigate, as it was already dark and the area was well known for being dangerous due to the presence of drug dealers. The Morro do Vintém had a difficult terrain and was hard to access. With the help of firefighters, a team of police officers led by marshal Oscar Nunes arrived at the scene on the next day, 21 August.
The bodies were next to each other, slightly covered by grass. They were wearing suits, lead masks and water-proof coats. There was no sign of violence to the bodies or to the surrounding area. Next to the bodies, the police found an empty bottle of water and a packet containing two towels. The masks were a type typically used for protection from radiation, and it is these masks that have given the case its name. Police found a small notebook stating:
Which translates to:
Reconstruction
After an investigation, the detectives reconstructed a plausible narrative of the last days of both men.
On August 17, they left their city, Campos dos Goytacazes, stating that they intended to buy some materials for use at their work. They took a bus and arrived in Niterói at 14:30. They bought the impermeable coats at a small shop and the bottle of water at a bar. The waitress who served them on the bar stated that Miguel seemed very nervous and looked at his watch frequently. From the bar, they went directly to the place where they were later found dead.
Conclusion of the case
No obvious injuries were discovered at autopsy; however, a search for toxic substances was impossible as the internal organs of the two victims were not properly preserved.
The case was mentioned prominently (among other Brazilian cases) in Jacques Vallée's book Confrontations.
Footnotes

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