The state’s highest court ordered a new trial Thursday for an alleged member of a Roxbury street gang convicted of killing Herman Taylor III, a Metco student with no gang involvement who was shot to death near his Roxbury home in 2006.

The Supreme Judicial Court, in a 5-0 ruling, concluded that the Suffolk Superior Court trial of Lamory Gray, who allegedly belonged to a gang centered in the Bromley Heath housing development, was constitutionally flawed.