A 13-year-old boy shot in the head at a Staten Island playground last week has died, police said Tuesday — as cops revealed that an older teenager was arrested in connection to the gang-related violence.

Young Jamoure Harrell got caught in a turf war between rival gangs just before 4 p.m. Friday inside Reverend Doctor Maggie Howard Playground, near NYCHA’s Stapleton Houses, according to cops.

A .40 caliber slug fired from 95 yards away struck the innocent bystander while he sat on a playground bench with friends, NYPD Chief of Detectives James Essig said Tuesday.

Essig said the feud was between the Five and Two Sides street crews, and that Jamoure was an unintended target who did not belong to a gang.

The alleged shooter, a 16-year-old boy whose name was nto released, was picked up by US Marshals early Tuesday. 

He was charged with murder, criminal use of a firearm, menacing and two counts of assault, police said.

Cops got a lead on the alleged shooter when another member of the suspect’s gang — also a 13-year-old boy — “tells a story that him and his friends are from the Stapleton Houses and they just wanted to send a message.”

“He didn’t realize his friend had a gun,” Essig told reporters of the boy. “He identifies his friend and we arrest him.” 

Jamoure was rushed to Richmond University Medical Center, where he was initially listed in critical condition.

Law enforcement sources on Sunday said the teen was brain dead and police said that he succumbed to his injuries Monday.

The fatal shooting was deemed a homicide, according to cops. 

Despite the account from the NYPD, Jamoure’s aunt, who did not provide her name, said over the phone that her nephew was still alive at the hospital. 

“There’s no plug being pulled,” she said. “He’s still alive. He was not pronounced dead. If you go to the hospital, you’re going to see a bunch of people still there because he’s still very much there.”

When told about the aunt’s claims, the NYPD again said that Jamoure had died. 

Cops initially said the teen appeared to have been targeted in the deadly violence.

Malcolm Penn, who works as a violence interrupter, confirmed Friday that the young victim was an eighth-grader at the Eagle Academy for Young Men of Staten Island in the Clifton neighborhood.

Penn described the teenager as a “bright, energetic kid just full of life.”

“He’s a kid from this community. I knew him from coming out, playing basketball, being out in the park. He’s very energetic in the schools. For the most part, he’s an energetic, good kid.”

A nearby elementary school had to be put on lockdown following the late-afternoon shooting. 

“I heard gunshots and my friends were panicking. We all sat down quietly,” a second-grader at PS 78 told The Post.

“The teacher told us to be quiet. He told us to go under our seats. ‘Don’t move, don’t make no noise. I need to keep you guys safe,’” the little girl said.

“Everyone, my friends, were panicking. One girl was crying. I was scared.”

Mike Perry, 40, another violence interrupter, told The Post that the victim “didn’t look good” while EMTs were performing CPR.

“Seeing that stuff is very traumatic. You see a kid laying there … a bunch of other kids around wondering if their friend is going to survive or not,” Perry said.

“Just imagine what those kids are going through, the trauma they have to live through,” he added. 

Additional reporting by Jorge Fitz-Gibbon