In Miller v. Alabama, the United States Supreme Court held that mandatory life imprisonment without parole for those under the age of 18 at the time of their crimes violates the Eighth Amendment’s prohibition on cruel and unusual punishments.
Since that decision, state supreme courts and legislatures have grappled with how to deal with the implementation of the decision.
The Supreme Court of Nebraska issued three decisions applying the U.S. Supreme Court’s 2012 ruling in Miller v. Alabama, and you can access those decisions here, here, and here.