Based upon an incident that happened in California in the early 1950s. A man named Billy Cook murdered a family of five, including three children, and then killed a traveling salesman. He then kidnapped two hunters and took them across the border into Mexico, intending to kill them, too, but before he could he was captured by Mexican police and subsequently extradited to the US, where he was tried for the murders, convicted, and died in the gas chamber at San Quentin on Dec. 12, 1952.
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