The Arizona Supreme Court is sending a Golden Valley man's homicide case back to Mohave County Superior Court.
A unanimous ruling Friday erased a Court of Appeals decision upholding Philip Martin's first-degree murder conviction in the 2012 shotgun killing of neighbor Steven Jeffrey Schwartz.
A jury convicted Martin of second-degree murder in the case, but that verdict was overturned on appeal.
A second jury then convicted Martin of first-degree murder, but the justices said that violated constitutional protections against double jeopardy because the first jury considered whether to convict Martin of first-degree murder.
The justices ordered the Superior Court to consider whether to reduce Martin's latest conviction to second-degree murder or conduct a new trial.
Martin had said he shot Schwartz in self-defense because he thought Schwartz had a gun.