http://www.slate.com/articles/news_and_politics/jurisprudence/2015/07/will_kennedy_overturn_the_death_penalty_his_views_on_solitary_confinement.html

In some ways Justice Anthony Kennedy has spent years chipping away at the death penalty. He has been a leader in the Supreme Court’s move to limit some classes of criminal defendants (for instance, juveniles) from being executed for their crimes. Keenly attuned to what the rest of the world thinks about capital punishment, he has been careful to confine the ways it is practiced in this country.