OCALA, Fla. — A judge has ruled that a wrongful death lawsuit claiming that CNN’s Nancy Grace pushed the mother of a missing toddler to suicide through aggressive questioning on her show will be tried in federal court. ADVERTISEMENT U.S. Magistrate Judge Gary R. Jones ruled Monday that federal court would handle the lawsuit filed by Melinda Duckett’s relatives because the involved parties are from different jurisdictions, according to court documents. The lawsuit was filed in November 2006 and names the talk show host and CNN as defendants. Grace grilled Duckett on Grace’s CNN Headline News show in September 2006 about the disappearance of Duckett’s 2-year-old son, Trenton. Duckett fatally shot herself before the network aired the pre-taped interview. Authorities, who have said they believe Trenton is still alive, have named Melinda Duckett as the prime suspect in his disappearance. Attorneys involved in the case did not return phone messages left at their offices Tuesday. CNN is a division of Time Warner Inc.