The boy later died from his injuries.
Police were called to Dogwood Drive (21220) for a report of a person who had suffered a gunshot wound.
EMS began life-saving procedures after finding the boy in the rear yard of the home in cardiac arrest, and continued life-saving procedures while he was taken to Johns Hopkins Bayview Medical Center where he was later pronounced dead.
This incident is currently being investigated as an accidental injury death.
Police believe the teen was struck in the chest by a round or fragment of a round from a pellet rifle as he and a friend were shooting targets in the yard.
An investigating is ongoing at this hour.