BOSTON -- Two Boston teens face murder charges in the shooting death of a 13-year-old boy who prosecutors said was mistaken by the suspects for a rival gang member.

Suffolk District Attorney Daniel Conley said Nurudeen Alabi, 19, and Darrell Rodrigues, 17, will be arraigned Friday in Roxbury District Court. Both are in custody on unrelated matters.

The victim, Luis Gerena, was a sixth-grader at the Clarence R. Edwards Middle School when he killed in January 2007.

Family members said he had stayed late at school to extra work and was walking home from the Jackson Square MBTA station when he was gunned down.

Conley said the victim was a "good kid" and had no known associations with gangs.