Joseph Maddick (plaintiff) and Roberta DeShon (defendant) were married for 20 years. The couple divorced, and Joseph was ordered to pay Roberta $500 per month in periodic, modifiable maintenance. One year later, the parties reached a stipulation providing that Joseph would pay Roberta $750 per month for seven years. The parties agreed that the award was non-modifiable and would terminate only upon the Joseph’s death. Three years later, Roberta remarried. A Missouri statute provided that a spousal-maintenance award would terminate upon the remarriage of the recipient. Joseph petitioned the court for modification, alleging that Roberta's remarriage was a change of circumstances. The trial court agreed and terminated maintenance. Roberta appealed.