January 1, 1957 - Edson Izidoro Guimarães
Working within a hospital setting gave him access that most killers never have — sustained, unsupervised proximity to the vulnerable. Guimarães operated as a nursing assistant, and the gap between his four convictions and the suspected total of 131 deaths points to how thoroughly institutional trust can shield ongoing harm from scrutiny.
From Wikipedia
Edson Isidoro Guimarães (born 1957) is a Brazilian nursing assistant and convicted serial killer. He confessed to five murders of which he was convicted of four, but is suspected of committing up to 131 in total. He claimed that he chose patients whose conditions were irreversible and who were in pain.
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