Harold Hamm is the chief executive of oil driller company Continental Resources and is worth more than $8 billion. He’s currently going through a divorce — a very intense one. According to his attorney, Hamm offered to pay his former wife $974.8 million, but she rejected the hand-written check delivered to her legal team because it just wasn’t enough.

“Ms. Arnall, through her counsel, stated that they were rejecting the … payment because Ms. Arnall did not want to risk the dismissal of her appeal by acceptance of the benefits,” Hamm’s attorney, Michael Burrage, told CNBC.

Arnall, a former Continental executive who was married to Hamm for 26 years, contends that her award of around $1 billion in cash and assets was inadequate and allowed Hamm to keep the lion’s share of a fortune her lawyers valued as high as $18 billion.

Harold Hamm had already paid his former wife more than $20 million during the divorce proceedings.

Hamm’s appeal contends that the $1 billion award was too steep. Hamm has lost billions tied to the value of his 68 percent stake in Continental in recent months, which his legal team blames on the sharp fall in oil prices.

–Jamaal Fisher (@jamaalfisher)