The 15-year-old boy who was gravely wounded in a broad-daylight Brooklyn shooting died early Tuesday, authorities said – as they revealed that he was an innocent bystander.

Faridun Mavlonov – a James Madison High School student who dreamed of becoming a professional UFC fighter – was shot in the back during a clash on 62nd Street near 20th Avenue in Bensonhurst around 1 p.m. Monday, according to cops.

“Today my son died,” Mavlonov’s father, Firdavs Mavlonov, whose first language is Russian, told reporters. “Maybe another day, different people’s son died.”

“Every time is dangerous, every day dangerous.”

NYPD Chief of Department James Essig said that the slain teen was simply in the wrong place at the wrong time.

The 17-year-old shooter – who is on cops’ radar but has not yet been caught – got into an argument with another boy during summer school at Franklin Delano Roosevelt HS — and the two agreed to meet after for a fistfight, Essig told reporters Tuesday.

The teen who was targeted in the shooting was walking with five other boys – including Mavlonov – and a girl when the suspect pulled out a gun and fired off seven rounds, the chief said.

The rounds missed the suspect’s rival – but Mavlonov was hit in the back, police said.

Mavlonov — who lives less than a mile from where he was mortally wounded — was rushed to Maimonides Medical Center, where he was initially listed in critical condition. 

He succumbed to his injuries Tuesday morning, police said.

The slain teen dreamed of becoming a UFC fighter, and often took a defensive stance both in the ring and in his relationships, a friend and former sparring partner said Tuesday. 

“He wouldn’t use violence against a situation,” the 15-year-old friend said. “I remember I actually called him to stop a fight… He didn’t want to fight. What he did was settle it down, that’s it.

“He was like a big brother for everyone,” the pal added. “He looked out for them.”

The teen, who went to a different high school but attended the same judo studio as the victim, said: “When you need someone to talk to, he would always be there. Even if you didn’t have money, you’d be like, ‘Yo, I’m hungry,’ he would put you first… Doesn’t matter how he is, if he’s hungry or not. He’ll put you first and make sure he takes care of you.”

“He makes [other people’s] days…and then goes on with his own day,” the boy recalled. “He was very good of a friend. I just didn’t know that this would happen to him, especially yesterday…. He was a very mature kid.”

Relative Azat Jorayev, 39, who said he is Mavlonov’s dad’s cousin, called the slain teen a “very kind, very lovely and calm boy.”

“He was good at sports and did well at school,” Jorayev said. “He was a good friend and he had lots of friends.”

Jorayev added that his relative “didn’t have any enemies” and “always stayed out of trouble, never got involved in any fights.”

“The criminal should be punished,” he said. “The loss of a child in a family is an irreplaceable loss and that’s why the guilty person should be punished.”

Mansur Djahongirov, 37, who owns a trucking company next to the barber shop where the victim’s dad works, said that the slain teen “always listened to his father.”

“He used to come see his father, you know, help him to bring towels and all that stuff,” Djahongirov said. “He was really good.”

The 15-year-old high schooler is the eldest of six children: he has two brothers and three sisters. He was born in Uzbekistan and came to the US 10 years ago.

“He sometimes brings his little brothers to see his father,” Djahongirov said. They are all hard-working, you know.”

Djahongirov, who is also from Uzbekistan, said “nobody does nothing,” about violent teen-on-teen acts like the one that took Mavlonov’s life.

“I don’t know, it’s different, I guess,” he said. “I’m from a Third World country so we never have this kind of stuff, killing each other in my country — we never.”

Mavlonov was one of five teens shot in the Big Apple in three separate incidents on Monday alone, authorities said. He was the only one killed in the violence. 

“My son died,” the teen’s grief-stricken father said. “I’m going to [do] something [to] help everybody [with a] child that died.”

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.”