A Missouri woman pleaded guilty in federal court Wednesday to the kidnapping and murder of a pregnant Arkansas woman and her unborn child. “This horrific crime resulted in the tragic deaths of two innocent victims,” said U.S. Attorney Teresa Moore. “Today’s guilty plea holds this defendant accountable for her actions and ensures that justice will be served. She is now subject to a mandatory sentence of life in federal prison without parole.” Amber Waterman, 44, pleaded guilty before U.S. District Judge Stephen R. Bough to one count of kidnapping resulting in death and one count of causing the …