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 15-year-old boy was charged…

“Everyone else is scratching their heads like where the hell did this come from,” the owner said.