<Tr> <Td> 2004 </Td> <Td> Schriro v. Summerlin </Td> <Td> The Ring v. Arizona decision does not apply retroactively to cases already final on direct review . </Td> <Td> 5 - 4 </Td> </Tr> <Tr> <Td> 2005 </Td> <Td> Roper v. Simmons </Td> <Td> The death penalty for those who had committed their crimes under 18 years of age is unconstitutional . </Td> <Td> 5 - 4 </Td> </Tr> <Tr> <Td> 2006 </Td> <Td> Oregon v. Guzek </Td> <Td> States may limit the evidence of innocence a defendant may present at his sentencing hearing to evidence already presented at his trial . </Td> <Td> 8 - 0 </Td> </Tr> <Tr> <Td> 2006 </Td> <Td> Hill v. McDonough </Td> <Td> Challenging constitutionality of the execution method is a § 1983 lawsuit, not an habeas corpus petition, and thus not subject to the procedural bar on successive petitions . </Td> <Td> 9 - 0 </Td> </Tr>

The supreme court ruled the death penalty as unconstitutional in the case of