A federal judge added more than $3.3 million in interest to a $15 million verdict a jury awarded to a Tulsa, Okla., couple whose son was killed in a 2003 traffic accident.

U.S. Chief District Judge Claire Eagan decided $3,339,550.68 in prejudgment interest from Ford Motor Co. should be added to the amount the jury awarded Kevin and Veronica Moody on Nov. 20.