Lisa montgomery
Expectant mother's killer becomes US's 1st federal execution of woman in decades
The US Justice Department said Lisa Montgomery, 52, was pronounced dead at 1:31 am Eastern Time at a penitentiary in Terre Haute, Indiana.
Sixteen years on, the United States is preparing to execute her, and experts are still studying the case so they can understand what prompts such a crime -- and how to prevent it in future.