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Bourdain, host of CNN's food-and-travel-focused "Parts Unknown" television series, was 61. Brash and opinionated, he had spoken openly about his use of drugs and addiction to heroin earlier in his life.
"No trace of narcotics. No trace of any toxic products. Trace of medicines in therapeutic dose. Trace of alcohol," he said, listing the findings of the investigationn.
Bourdain, whose career catapulted him from washing dishes at New York restaurants to dining in Vietnam with President Barack Obama, hanged himself in a hotel room near Strasbourg, France, where he had been working on an upcoming episode of his TV series, according to CNN.