The 15-year-old boy who was gravely wounded in a broad-daylight Brooklyn shooting died early Tuesday, authorities said.

Foridun Maulonou was shot in the back during a clash on 62nd Street near 20th Avenue in Bensonhurst around 1 p.m. Monday, according to cops.

Maulonou — who lives less than a mile from the scene — was rushed to Maimonides Medical Center, where he was initially listed in critical condition, but succumbed to his injuries Tuesday morning, police said. 

Investigators believe there was one shooter – who is known to the victim to some degree – but their exact relationship is not known. 

The suspect was described as a male with a dark complexion wearing a gray sweatshirt with dark sweatpants. He also wore a black mask over his face.

Security footage from the scene showed him walking down the sidewalk amongst a crowd of teens, before suddenly drawing a handgun and opening fire across the street.

The suspect then took off running as the teens around him fled for cover. Witnesses told ABC 7 that Maulonou tried to run, but collapsed about a half-block away. He could be seen limp and being loaded into an ambulance after police performed CPR.

The exact nature of the dispute leading to the fatal shooting remained unclear Tuesday. 

Neighbor Isaac Freithe, 50, told The Post he was working from home when he heard the shots ring out and began filming the scene.

“I was just in my apartment when I hear eight or nine shots,” he said. “I go out and see eight or nine guys maybe between 15 or 16 years old and they’re running away.”

“And I go out in my apartment and I can see the boy falling in the street.”

“It was in this moment he was like dead. But no! The police touched him here, and he had no pulse,” Freithe said, miming CPR compressions. “And he started breathing again.”

“It’s the quietest neighborhood. Literally the worst thing that happens is your window gets busted at night,” neighborhood resident Moshe Hayum said. “Nothing ever happens in this neighborhood.”