A 15-year-old boy allegedly shot and killed a 54-year-old man in Brooklyn on Wednesday, according to police.

Darryl McMillan, of Queens, was shot in the chest at 751 Monroe Street in Bedford-Stuyvesant around 3:40 p.m., cops said.

McMillan was rushed to Kings County hospital where he died from his wounds.

The teenage shooter, who has not been named due to his age, was arrested on Thursday afternoon.

He is charged with murder and two counts of criminal possession of a weapon.