A 15-year-old boy has been arrested for fatally blasting a man in the head outside a Brooklyn deli in broad daylight earlier this month, authorities said Wednesday.

The teen was nabbed Tuesday in connection to the Aug. 21 shooting of 24-year-old Abdolaye Ba outside the Best Food Mini Market on Blake Avenue near Pennsylvania Avenue in East New York, police said.

Ba — who lived about two blocks away from the deli — was brought to Brookdale University Hospital and Medical Center after he was shot at around 3:30 p.m., police said.

He died from his injuries three days later, cops said.

The violence took place down the block from Thomas Jefferson High School.

The teen suspect was charged with murder and criminal possession of a weapon, police said. 

His name was not released by the NYPD because he is a minor. 

The motive for the shooting was unclear Wednesday.