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Harold Hamm
In a 7-2 decision Tuesday, the state's highest court ruled in favor of Hamm, the chairman and CEO of energy giant Continental Resources and granted his motion to dismiss the appeal by Sue Ann Hamm.
The couple was married for more than 20 years before Sue Ann Hamm filed for divorce in 2012.
An Oklahoma County judge in November approved the couple's divorce settlement, which included an award of nearly $1 billion to Sue Ann Hamm.
But Sue Ann Hamm appealed, arguing that the amount was only a fraction of the couple's estimated $18 billion wealth.
Reuters