The shooting happened just after 5:10 a.m. inside a home at 1346 Prospect Avenue in the Morrisania section of the Bronx.
The victim suffered a gunshot wound to the head and was pronounced dead at the scene. His identity has not been released pending family notification.
Police are looking for a 16-year-old male who ran from the apartment following the shooting. Investigators described him as medium height and last seen wearing a light-colored T-shirt and beige shorts. No arrests have been made.
Detectives believe the teenagers may have been handling a firearm when it discharged, though the circumstances surrounding the shooting remain under investigation.
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