A jury found Jimothy Jenkins guilty of being party to first-degree intentional homicide in connection with a street shooting in 2007 that left Anthony Weaver dead. Jenkins was sentenced to life in prison.
He argued that his attorney was ineffective because he failed to call an eyewitness to testify that Jenkins wasn't the shooter.
The First District Court of Appeals rejected Jenkins' argument last year. The Supreme Court reversed that decision Friday, ruling 5-2 that Jenkins has shown his attorney was ineffective.
The state Department of Justice defended Jenkins' appeal. An agency spokeswoman says only that attorneys are reviewing the decision.