Two former assistant managers at Casey's General Stores say the convenience store chain didn't pay them overtime wages. Kristina Jones and Kim Marrs say they plan to file a class action lawsuit in U.S. District Court in Sioux City today. They claim the Ankeny-based chain didn't pay them for working off-the-clock. Jones worked in several Des Moines stores, while Marrs worked at two stores in Missouri. Their attorney, Scott Peters of Council Bluffs, says there could be hundreds of other people who may qualify for the class action suit. Casey's operates about 1,500 stores in nine states.