"<div class=""caption-credit""> Photo by: L. Matthew Bowler</div><div class=""caption-title"">Christy Walton</div>Christy Walton <br> <br> Net worth: $28.2 billion <br> Country: U.S. <br> Source of wealth: Wal-Mart <br> Christy Walton's net worth reached new highs as Wal-Mart stock jumped in 2012. She remains the richest woman in the United States. Christy inherited her wealth when husband John Walton, a former Green Beret and Vietnam war medic, died in an airplane crash in 2005. <br>"
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