Sue Ann Arnell, a longtime attorney at Hamm's oil company, had earlier indicated she would pursue an appeal on the grounds that the nearly $1-billion settlement was unfair. Sue Ann Arnall, the ex-wife of Oklahoma oil magnate Harold Hamm, has deposited a handwritten $975 million divorce cheque, Hamm's lawyer said on Thursday, in a move that may end an epic divorce battle over a fortune worth billions.