The Supreme Court of Louisiana has held that Miller v. Alabama, which requires that a sentencing judge have discretion to sentence an under-18 murderer to something less than life without parole, is not retroactive to cases that were already final on direct appeal when Miller was decided.

Louisiana follows the rule of Teague v. Lane.  Miller is a procedural rule, not a substantive one, and it does not fall within the small (extinct?) class of precedents deemed "watershed" rules.

The case is State v. Tate, 2012-OK-2763.