A 19-year-old with a long history of violence was in the custody of the District’s embattled juvenile justice agency when he allegedly killed another man over a piece of costume jewelry, setting off a spiral of violence that police say led directly to one of the District’s deadliest rampages, the Washington Examiner has learned.

Sanquan Carter is charged with second-degree murder in the March 22 shooting death of Jordan Howe. Police say Carter and his brother, Orlando, shot Howe because they mistakenly believed Howe had stolen a gold colored bracelet.