In Graham v. Florida (2010), the Court ruled that it was unconstitutional to impose mandatory life sentence without parole on prisoners who committed non-murder crimes as juveniles.

[2][3] Henry Montgomery was 17 years old on November 13, 1963, when he shot and killed police officer Charles Hurt, a sheriff's deputy, in East Baton Rouge Parish, Louisiana.

[4][5][6][7][8][9][10][11][12][excessive citations] A jury convicted Montgomery of murder and sentenced him to death in February 1964 but, in January 1966, the divided Louisiana Supreme Court annulled that verdict, finding he had not received a fair trial due to public prejudice.

[16] In February 1969, a jury again convicted Montgomery of murder, triggering an automatic sentence of life in prison without parole, which was affirmed by the Louisiana Supreme Court in November 1970, over the dissent of Justice Mack Barham.

[21] Criticizing the majority's "sleight of hand", Scalia wrote that Kennedy had twisted the language in the Miller decision to make it sound categorical when it merely required a new sentencing procedure.

[23] On June 28, 2016, the Louisiana Supreme Court vacated Montgomery's life sentence and remanded for resentencing in a per curiam decision, with Justice Scott Crichton additionally concurring.

[29] In March 2020, the Supreme Court agreed to hear a related case, Jones v. Mississippi, involving a person who had killed his grandfather when he was 15 in 2004 and given the mandatory sentence of life without parole.