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Walter Hartwell White Sr. (September 7th, 1958 - September 10th, 2010), also known by his moniker Heisenberg, was an American high school teacher and drug lord primarily involved in methamphetamine production and distribution in New Mexico and the American Southwest between 2008 and 2010. Before his entrance into the drug trade, he taught chemistry at J.P. Wynne High School in Albequerque, New Mexico. Through his "Heisenberg" alias, Walter White became a notorious figure in the criminal underworld of New Mexico, and he was heavily implicated in several killings in Albuquerque as well as the downfall and discovery of Gus Fring's drug cartel.