Jonathan Sanders, 19, of Dorchester, has been charged with gunning down another teen on a T bus last spring, the Suffolk County DA's office and Boston police announced.
Conveniently for authorities, Sanders was already locked up, on an unrelated probation violation at the Nashua Street jail. He is scheduled for a Thursday arraignment in Dorchester District Court on a charge of murder for the March 30, 2007 death of Dwayne Graham, 18, of Hyde Park.
Graham was killed on a 23 bus around 4 p.m. at Washington Street and Columbia Road.
The Suffolk County DA's office and Boston Police say grand jury investigations into a spate of street killings around the same time last year continue.