The Cobb County couple suing General Motors over an ignition switch defect they say caused their daughter’s death have won an important victory.

The lawsuit that launched recalls for millions of cars is back in litigation before Cobb County State Court Judge Kathryn Tanksley after Kenneth and Mary Elizabeth Melton defeated an attempt by GM to move the case to federal court and merge it with a host of others in multidistrict litigation that are likely to be slowed down, settled confidentially or even frozen under the remnants of the company’s bankruptcy proceedings, also in federal court in New York. The couple is attempting to return $5 million the company paid them to settle, saying GM had been withholding important information when the case was resolved.