Christy Walton, $41.7 Billion
Widow of John T. Walton, one of the sons of Walmart founder Sam Walton, Christy Walson is the main heir to her late husband's fortune following his death in a plane crash in 2005. She was the richest woman in the world for several years. Much of her wealth is now in the hands of their son, Lukas Walton.
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