This case asks the Supreme Court to decide whether the United States Court of Appeals for the Fourth Circuit erred when it granted respondent Lee Boyd Malvo’s habeas corpus petition to reconsider his life-imprisonment-without-parole sentence, yet declined to decide whether Malvo’s sentence was mandatory or discretionary. Petitioner warden Randall Mathena argues that Malvo’s sentence must stand because the Supreme Court in Miller v. Alabama expressly limited availability of habeas relief to juveniles sentenced to life imprisonment without parole under mandatory sentencing schemes, and because the precedent upon which the Supreme Court based that opinion does not support expanding the rule to discretionary sentencing schemes. Malvo counters that he should be resentenced because the Supreme Court precedent and the Court’s decision in Montgomery v. Louisiana—extending Miller retroactively to cases on collateral review—requires sentencing judges to take juveniles’ youth into account during sentencing, even if the sentence occurred before Miller. Malvo further contends that even if he were sentenced pursuant to a “discretionary” sentencing scheme, his life sentence violates Miller because the sentencing judge failed to consider, on account of his juvenile status, his lessened moral blameworthiness and greater capacity for change, therefore entitling him to resentencing. The outcome of this case will affect how the criminal justice system treats juveniles and victims, whether the system will preserve the distinction between discretionary and mandatory sentencing schemes.